CBS CORP
11-K, 1998-06-29
TELEVISION BROADCASTING STATIONS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549-1004

                                    FORM 11-K
                     ANNUAL REPORT PURSUANT TO SECTION 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1997

                          Commission File Number 1-977

               WESTINGHOUSE DE PUERTO RICO RETIREMENT SAVINGS PLAN
                            (Full title of the Plan)

                                 CBS CORPORATION
                               51 West 52nd Street
                            New York, New York 10019

           (Name of issuer of the securities held pursuant to the Plan
               and the address of its principal executive office)

<PAGE>   2

                        WESTINGHOUSE DE PUERTO RICO, INC.
                        RETIREMENT SAVINGS PLAN

                        Financial Statements as of December 31, 1997
                        and 1996, and Schedules as of December 31, 1997

                        (With Independent Auditors' Report Thereon)



<PAGE>   3


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                   Index to Financial Statements and Schedules

                           December 31, 1997 and 1996

<TABLE>
<CAPTION>

                                                                                                             Page
                                                                                                             ----

<S>                                                                                                         <C>
Independent Auditors' Report                                                                                   1

Statements of Net Assets Available for Benefits, With Fund Information                                       2 - 3

Statement of Changes in Net Assets Available for Benefits, With Fund Information                             4 - 5

Notes to Financial Statements                                                                                6 - 13

Schedule 1 - Line 27(a) - Schedule of Assets Held for Investment Purposes                                     14

Schedule 2 - Line 27(d) - Schedule of Reportable Transactions                                               15 - 17
</TABLE>


All other schedules required by the Department of Labor's Rules and Regulations
for Reporting and Disclosure under the Employee Retirement Income Security Act
of 1974, as amended (ERISA), have been omitted because there is no information
to report.



<PAGE>   4


                          Independent Auditors' Report
                          ----------------------------


To the Participants and Administrator of the
     Westinghouse de Puerto Rico, Inc. Retirement Savings Plan:


We have audited the accompanying statements of net assets available for benefits
of the Westinghouse de Puerto Rico, Inc. Retirement Savings Plan (the Plan) as
of December 31, 1997 and 1996, and the related statement of changes in net
assets available for benefits for the year ended December 31, 1997. These
financial statements are the responsibility of the Plan Administrator. Our
responsibility is to express an opinion on these financial statements based on
our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for benefits of the Plan as of
December 31, 1997 and 1996, and the changes in net assets available for benefits
for the year ended December 31, 1997, in conformity with generally accepted
accounting principles.

Our audits were performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedules of assets held
for investment purposes and reportable transactions are presented for the
purpose of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure under
the Employee Retirement Income Security Act of 1974, as amended (ERISA). The
fund information in the statements of net assets available for benefits and the
statement of changes in net assets available for benefits is presented for
purposes of additional analysis rather than to present the net assets available
for Plan benefits and changes in net assets available for Plan benefits of each
fund. The supplemental schedules and fund information have been subjected to the
auditing procedures applied in the audits of the basic financial statements and,
in our opinion, are fairly stated in all material respects in relation to the
basic financial statements taken as a whole.


/s/ KPMG PEAT MARWICK LLP
- --------------------------

Pittsburgh, Pennsylvania
June 5, 1998


<PAGE>   5

                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

      Statement of Net Assets Available for Benefits, With Fund Information

<TABLE>
<CAPTION>
                                                                                                     December 31, 1997
                                                        ---------------------------------------------------------------------------
                                                                                             Fund Information
                                                        ---------------------------------------------------------------------------
                                                                                            Participant Directed
                                                        ---------------------------------------------------------------------------
                                                                                                  Fidelity              CBS
                                                                Fixed            Vanguard          Growth             Common
                                                               Income             Mutual          & Income             Stock       
                                                                Fund               Fund             Fund               Fund        
                                                                ----               ----             ----               ----        
<S>                                                     <C>                   <C>               <C>                <C>            
Investments, at fair value:
     Registered investment companies                    $              -           823,578           156,626                -      
     CBS common stock                                                  -                 -                 -          336,741      
     Loans to participants                                             -                 -                 -                -      
     Interest-bearing cash                                             -                 -                 -               31      
                                                         ---------------      ------------      ------------       ----------      
                                                                       -           823,578           156,626          336,772      

Investments, at contract value:
     Beneficial interest in the Westinghouse
        Savings Program Master Trust (note 4)                  2,609,580                 -                 -                -      
                                                               ---------      ------------      ------------     ------------      
                  Total investments                            2,609,580           823,578           156,626          336,772      

Receivables:
     Interest and dividends                                            -                 -                 -                4      
                                                         ---------------      ------------      ------------      -----------      
                  Total assets                                 2,609,580           823,578           156,626          336,776      

Liabilities:
     Plan transfer (note 6)                                   (2,474,304)         (733,029)         (137,375)        (235,233)     
                                                               ---------           -------           -------          -------      
                  Net assets available for benefits        $     135,276            90,549            19,251          101,543      
                                                              ==========          ========          ========          =======      
</TABLE>
<TABLE>
<CAPTION>

                                                    
                                                    -----------------------------
                                                    
                                                    ------------
                                                    
                                                    ------------
                                                    
                                                    
                                                         Loan
                                                         Fund             Total
                                                         ----             -----

<S>                                                 <C>                   <C>    
Investments, at fair value:
     Registered investment companies                           -          980,204
     CBS common stock                                          -          336,741
     Loans to participants                               384,427          384,427
     Interest-bearing cash                                     -               31
                                                    ------------    -------------
                                                         384,427        1,701,403

Investments, at contract value:
     Beneficial interest in the Westinghouse
        Savings Program Master Trust (note 4)                  -        2,609,580
                                                    ------------        ---------
                  Total investments                      384,427        4,310,983

Receivables:
     Interest and dividends                                    -                4
                                                    ------------   --------------
                  Total assets                           384,427        4,310,987

Liabilities:
     Plan transfer (note 6)                             (383,915)      (3,963,856)
                                                         -------        ---------
                  Net assets available for benefits          512          347,131
                                                       =========       ==========
</TABLE>


See accompanying notes to financial statements.

                                       2
<PAGE>   6

                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

      Statement of Net Assets Available for Benefits, With Fund Information
<TABLE>
<CAPTION>

                                                                                                   December 31 ,1996
                                                                   ----------------------------------------------------------------
                                                                                           Fund Information
                                                                   -------------------------------------------------
                                                                                        Participant Directed
                                                                   -------------------------------------------------
                                                                                                             CBS
                                                                          Fixed       Vanguard             Common
                                                                         Income        Mutual               Stock
                                                                          Fund          Fund                Fund            Total
                                                                          ----          ----                ----            -----

<S>                                                                <C>                   <C>                 <C>          <C>      
Investments, at fair value:
     Registered investment companies                               $             -       910,662                   -        910,662
     CBS (formerly Westinghouse Electric Corporation) common stock               -             -             450,148        450,148
     Interest-bearing cash                                                       -             -                  36             36
                                                                   --------------- -------------         ----------- --------------
                                                                                 -       910,662             450,184      1,360,846

Investments, at contract value:
     Beneficial interest in the Westinghouse Savings Program
        Master Trust (note 4)                                            4,156,850             -                   -      4,156,850
                                                                         --------- -------------       -------------      ---------
                  Total investments                                      4,156,850       910,662             450,184      5,517,696

Receivables:
     Interest and dividends                                                      -            69                  32            101
                                                                   ---------------   -----------         -----------  -------------
                  Total assets                                           4,156,850       910,731             450,216      5,517,797

Liabilities:
     Plan transfer (note 6)                                               (522,322)     (120,395)            (38,694)      (681,411)
                                                                        ----------       -------             -------     ----------
                  Net assets available for benefits                $     3,634,528       790,336             411,522      4,836,386
                                                                         =========       =======             =======      =========

</TABLE>

See accompanying notes to financial statements.


                                       3

<PAGE>   7


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits, With Fund Information

                          Year Ended December 31, 1997
<TABLE>
<CAPTION>

                                                                            Fund Information
                                                      ---------------------------------------------------------
                                                                          Participant Directed
                                                      ---------------------------------------------------------
                                                                                   Fidelity      CBS
                                                        Fixed       Vanguard        Growth     Common
                                                       Income        Mutual        & Income     Stock     Loan
                                                        Fund          Fund           Fund       Fund      Fund             Total
                                                        ----          ----           ----       ----      ----             -----

<S>                                                      <C>          <C>              <C>     <C>                         <C>    
Additions to net assets attributed to:
     Investment income:
        Net appreciation in fair value of investments  $       -      218,619           9,624  126,144          -          354,387
        Interest on participant loans                      6,922        1,437             232      367          -            8,958
        Interest and dividends                                 -       20,621           3,263    3,690          -           27,574
        Net investment gain from the Westinghouse
           Savings Program Master Trust (note 4)         199,277            -               -        -          -          199,277
                                                       --------- ------------    ------------ --------  ---------       ----------
                  Total investment income                206,199      240,677          13,119  130,201          -          590,196

Contributions:
     Employer's contributions                            159,811       27,958           2,702   14,441          -          204,912
     Participants' contributions                         414,386       84,142           6,999   39,462          -          544,989
                                                       ---------     --------       --------- --------  ---------       ----------
                  Total contributions                    574,197      112,100           9,701   53,903          -          749,901
                                                       ---------      -------       --------- --------  ---------       ----------

                  Total additions                        780,396      352,777          22,820  184,104          -        1,340,097

                                                                                                                        (Continued)
</TABLE>
                                       4
<PAGE>   8


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits, With Fund 
                             Information, Continued

                          Year Ended December 31, 1997
<TABLE>
<CAPTION>
                                                                                             Fund Information
                                                                 -------------------------------------------------------------------
                                                                                           Participant Directed
                                                                 -------------------------------------------------------------------

                                                                                                     Fidelity              CBS
                                                                   Fixed            Vanguard          Growth             Common
                                                                  Income             Mutual          & Income             Stock     
                                                                   Fund               Fund             Fund               Fund      
                                                                   ----               ----             ----               ----      

<S>                                                           <C>                      <C>               <C>             <C>        
Deductions from net assets attributed to:
     Benefits paid to participants                               (1,358,534)         (388,075)           (1,141)        (102,687)   
     Loans to participants, net of repayments                      (316,060)          (47,819)              933          (21,481)   
     Refund of employee contributions                                (8,406)           (4,224)                -              (34)   
                                                                -----------          --------      ------------       ----------    
                  Total deductions                               (1,683,000)         (440,118)             (208)        (124,202)   
                                                                  ---------           -------         ---------          -------    

                  Net (decrease) increase prior to interfund
                     and plan transfers                            (902,604)          (87,341)           22,612           59,902    

Interfund transfers                                                (118,317)          127,335           134,014         (143,032)   
Plan transfers (note 6)                                          (2,478,331)         (739,781)         (137,375)        (226,849)   
                                                                  ---------           -------           -------          -------    
                  Total transfers                                (2,596,648)         (612,446)           (3,361)        (369,881)   
                                                                  ---------           -------          --------          -------    

                  Net (decrease) increase                        (3,499,252)         (699,787)           19,251         (309,979)   

Net assets available for benefits:
     Beginning of year                                            3,634,528           790,336                 -          411,522    
                                                                  ---------           -------     -------------          -------    
     End of year                                              $     135,276            90,549            19,251          101,543    
                                                                 ==========          ========          ========          =======    
</TABLE>
<TABLE>
<CAPTION>
                                                                            
                                                                 --------------

                                                                 --------------

                                                              
                                                              
                                                                        Loan
                                                                        Fund             Total
                                                                        ----             -----

<S>                                                                         <C>          <C>    
Deductions from net assets attributed to:
     Benefits paid to participants                                            -       (1,850,437)
     Loans to participants, net of repayments                           384,427                -
     Refund of employee contributions                                         -          (12,664)
                                                                   ------------       ----------
                  Total deductions                                      384,427       (1,863,101)
                                                                        -------        ---------

                  Net (decrease) increase prior to interfund
                     and plan transfers                                 384,427         (523,004)

Interfund transfers                                                           -                -
Plan transfers (note 6)                                                (383,915)      (3,966,251)
                                                                        -------        ---------
                  Total transfers                                      (383,915)      (3,966,251)
                                                                        -------        ---------

                  Net (decrease) increase                                   512       (4,489,255)

Net assets available for benefits:
     Beginning of year                                                        -        4,836,386
                                                                   ------------        ---------
     End of year                                                            512          347,131
                                                                      =========       ==========
</TABLE>

See accompanying notes to financial statements.

                                       5
<PAGE>   9
                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                          Notes to Financial Statements

                           December 31, 1997 and 1996



(1)   Description of Operations and Summary of Significant Accounting Policies
      ------------------------------------------------------------------------

      Westinghouse Electric Company, S.A. (the Company), a wholly owned
          subsidiary of CBS Corporation (the Corporation), formerly Westinghouse
          Electric Corporation, is the successor plan sponsor to Westinghouse de
          Puerto Rico, Inc. Westinghouse de Puerto Rico, Inc. was a wholly owned
          subsidiary of the Corporation until October 31,1997, at which time it 
          was sold to Ingersoll-Rand Company. CBS Corporation is one of the 
          largest radio and television broadcasters in the United States.

      The sale of Westinghouse de Puerto Rico, Inc. resulted in substantially
          all Westinghouse de Puerto Rico, Inc. Retirement Savings Plan (the
          Plan) participants being transferred to a plan sponsored by Thermo
          King de Puerto Rico, Inc. (see note 6). The Corporation has the right
          to terminate the Plan at any time. Due to the limited number of
          participants remaining in the Plan, management of the Corporation is
          considering the cost effectiveness of the Plan and may terminate the
          Plan in the near future. If such termination occurs, all amounts
          credited to participants' accounts shall become vested and be
          distributed pursuant to ERISA regulations.

      Basis of Accounting
      -------------------

      The financial statements of the Plan are prepared under the accrual basis
          of accounting.

      Investments
      -----------

      The Plan's shares of common stock and registered investment companies are
          presented at fair market value, which is based on published market
          quotations. Guaranteed investment contracts with insurance companies
          and synthetic guaranteed investment contracts held in the Westinghouse
          Savings Program Master Trust (Master Trust), in which the Plan's Fixed
          Income Fund has a beneficial interest, are presented at contract
          value. Loans to participants are valued at cost, which approximates
          fair value.

                                                                     (Continued)

                                       6
<PAGE>   10
                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued


      Measurement Date
      ----------------

      Purchases and sales of securities are recorded on a trade date basis.

      Dividends
      ---------

      Dividends on the Plan's shares of common stock and registered investment
          companies are credited to each participant's account, as appropriate,
          for shares held as of the date of record.

      Payment of Benefits
      -------------------

      Benefits are recorded when paid.

      Use of Estimates
      ----------------

      The preparation of financial statements in conformity with generally
          accepted accounting principles requires the Plan Administrator to make
          estimates and assumptions that affect the reported amounts of assets
          and liabilities and disclosure of contingent assets and liabilities as
          of the date of the financial statements and the reported amounts of
          Plan activity during the reporting period. Actual results could differ
          from those estimates.

(2)   Description of the Plan
      -----------------------

      The following description of the Plan provides only general information.
          Participants should refer to the Plan document or the summary Plan
          description for a more complete description of the Plan's provisions.

      General
      -------

      The Plan is a defined contribution plan effective as of January 1, 1992.
          The Plan is subject to the provisions of ERISA. The Plan covered all
          full-time employees rendering service in Puerto Rico who are or were
          employees of Westinghouse de Puerto Rico, Inc. and covers certain
          existing and former divisions and subsidiaries of CBS Corporation (the
          Companies) and who are not covered under a collective bargaining
          agreement. Casual employees, temporary employees or leased employees
          are not eligible to participate in the Plan.

                                                                     (Continued)

                                       7
<PAGE>   11
                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued


     The  administrative  managers  of the  Corporation's  plans  serve  as Plan
          Administrator  of the  Westinghouse  de Puerto Rico,  Inc.  Retirement
          Savings Plan.

     Contributions
     -------------

     Plan participants may elect to contribute on a pre-tax basis from 1% to 4%
          of their total compensation excluding bonuses and incentive awards as
          a basic contribution and from 1% to 4% extra of their total
          compensation excluding bonuses and incentive awards on a pre-tax basis
          as a supplementary contribution. Effective April 1, 1997, participants
          may elect to contribute on an after-tax basis from 1% to 4% of their
          total compensation excluding bonuses and incentive awards as an
          additional supplementary contribution. The Companies contribute an
          amount equal to 50% of the employee's basic contribution. The
          participant's maximum contribution cannot exceed the lesser of 12% of
          eligible compensation or $7,500 in 1997, (8% of eligible compensation
          or $7,500 in 1996), subject to the Puerto Rico Internal Revenue Code.
          The employee's election shall be effective for a minimum of one
          quarter.

     Upon enrollment in the Plan, a participant can elect for their
          contribution to be invested in one or more of the following four
          funds: the Fixed Income Fund; the Vanguard Index Trust 500 Portfolio
          (Vanguard Mutual Fund); the Fidelity Growth and Income Fund; or the
          CBS Common Stock Fund.

     Participants may direct their investments in 10% multiples in any
          combination they wish.

     The Companies have the right under the Plan to discontinue their
          contributions at any time.

     Rollovers
     ---------

     An  employee eligible to participate in the Plan may elect to deposit
          (roll over) into the Plan distributions received from other plans that
          are qualified by the Puerto Rico Internal Revenue Code. Rollovers are
          fully vested at all times and are nonforfeitable.

     Withdrawals
     -----------

     All participants are permitted to make withdrawals from the Plan subject
          to provisions in the Plan document. Distributions from the Plan upon
          retirement, termination or death shall be paid in cash and/or shares
          of common stock, as detailed in the Plan document.

                                                                     (Continued)

                                       8
<PAGE>   12
                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued


      Loans
      -----

      Effective April 1, 1997, participants are eligible to take a loan from the
          Plan. The amount of a loan generally cannot exceed the lesser of
          $50,000 or one-half of the participant's total pre-tax vested account
          balance. Loans bear interest at a fixed rate which is equal to the
          prime rate in effect on the last business day of the calendar quarter
          prior to the loan origination date, plus 1%. All loans are subject to
          specific repayment terms and are secured by the participant's
          nonforfeitable interest in his/her account equivalent to the principal
          amount of the loan.

      Vesting and Forfeitures
      -----------------------

      Participant contributions to the Plan plus actual earnings thereon are
          fully vested and nonforfeitable. If an employee had eligible service
          before January 1, 1992, the employer matching contributions plus
          actual earnings thereon are also vested. Employees hired on or after
          January 1, 1992, must complete three years of eligibility service to
          become vested in the employer matching contributions plus actual
          earnings thereon. If a participant terminates employment prior to
          completing three years of eligibility service, the current value of
          their employer matching contributions will be forfeited. Forfeited
          contributions are used to reduce future employer matching
          contributions. Amounts forfeited in 1997 were $6,897.

      Plan Expenses
      -------------

      The administrative managers are responsible for the general administration
          of the Plan and for carrying out the provisions thereof. The
          investment assets of the Plan are administered by a trustee appointed
          by the Corporation. Administrative expenses are paid directly by the
          Corporation and, accordingly, are not reflected in the Plan's
          financial statements.

                                                                     (Continued)

                                       9
<PAGE>   13


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued



(3)   Investments
      -----------

     The  following  table presents the values of investments  that represent 5%
          or more of the Plan's net assets as of December 31, 1997 and 1996:
<TABLE>
<CAPTION>

                                                                                1997               1996
                                                                                ----               ----

<S>                                                                         <C>                    <C>      
            Beneficial interest in the Westinghouse Savings
                 Program Master Trust                                       $  2,609,580           4,156,850
            Vanguard Institutional Index Fund                                          -             910,662
            Vanguard Index Trust 500 Portfolio                                   823,578                   -
            Fidelity Growth & Income Fund                                        156,626                   -
            CBS (formerly Westinghouse Electric
                 Corporation) common stock                                       336,741             450,148
</TABLE>

(4)   Master Trust (Dollar Amounts in Thousands)
      ------------------------------------------

     As   of December 31, 1997, the Master Trust includes the Fixed Income Fund
          of the Plan, as well as the Fixed Income Fund of another plan
          sponsored by the Corporation. The Master Trust is administered by
          Bankers Trust and governed by the Westinghouse Savings Program Master
          Trust Agreement. Although assets in the Master Trust are commingled,
          the trustee maintains records of contributions received from and
          distributions made to the Master Trust for each participating plan. As
          of December 31, 1997 and 1996, the Plan's beneficial interest in the
          net assets of the Master Trust was approximately 0.1% and 0.2%,
          respectively. Net assets and net investment income are allocated by
          the trustee to each plan based on the beneficial interest of each plan
          to the total beneficial interests of the participating plans on a
          daily basis.

     The  following table presents the values of investments in the Master Trust
          as of December 31, 1997 and 1996:
<TABLE>
<CAPTION>

                                                                   1997                             1996
                                                       ------------------------------   ---------------------------
                                                        Contract         Market          Contract        Market
                                                          value           value            value          value

<S>                                                   <C>                <C>              <C>             <C>      
       Guaranteed investment contracts                $     633,976        661,217        1,049,292         864,345
       Synthetic guaranteed investment
            contracts                                     2,106,927      2,125,700        1,670,842       1,672,145
       Cash (cash overdraft)                                (13,336)       (13,336)         148,253         148,253
                                                        -----------    -----------       ----------      ----------
                         Master Trust                 $   2,727,567      2,773,581        2,868,387       2,684,743
                                                          =========      =========        =========       =========
</TABLE>

                                                                     (Continued)

                                       10
<PAGE>   14


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued



      Market values of investments in the Master Trust are based on quoted
          market prices or on discounted cash flow analysis utilizing estimated
          current market interest rates.

      Synthetic guaranteed investment contracts utilize benefit-responsive
          wrapper contracts issued by various third-party issuers. The wrapper
          contracts provide market and cash flow risk protection to the Plan and
          provide for the execution of participant initiated transactions in the
          Plan at contract value. The synthetic guaranteed investment contracts
          may invest in derivatives and include collateralized mortgage
          obligations (CMOs), real estate investment conduits (REMICs), other
          mortgage derivatives, call/put options on Treasury securities and U.S.
          Treasury bond futures contracts. The notional and fair values of these
          derivatives, as estimated by the trustee and various investment
          managers, are $303,016 and $302,475 as of December 31, 1997, and
          $363,828 and $370,880 as of December 31, 1996, respectively.

     The  aggregate  investment  gain from the  Master  Trust for the year ended
          December 31, 1997, of $183,503 is solely comprised of interest income.
          Certain  expenses of the Master Trust are deducted  from the aggregate
          investment gain.

     The average yield of all investment contracts for the years ended December
          31,  1997 and  1996,  was  6.87% and  6.62%,  respectively,  while the
          crediting  interest  rate as of December 31, 1997 and 1996,  was 6.61%
          and 6.66%, respectively.

(5)   Tax Status
      ----------

     The  Plan  obtained a favorable  determination  letter dated  September 27,
          1993,  from the Puerto Rico Department of the Treasury which qualifies
          the  Plan as tax  exempt  under  the  provisions  of the  Puerto  Rico
          Internal  Revenue  Code (the  Code).  The Plan  Administrator  and the
          Plan's tax counsel  believe that the Plan is currently  being operated
          in compliance with the applicable requirements of the Code. Therefore,
          they believe  that the Plan was  qualified  and the related  trust was
          tax-exempt as of December 31, 1997 and 1996.

      Under the Puerto Rico income tax laws and regulations, a participant is
          not subject to income taxes on the contributions of the employing
          company, or on the interest from insurance contracts and investment
          income received by the Trustee until the participant's account is
          distributed or withdrawals are made.

                                                                     (Continued)

                                       11
<PAGE>   15


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued


(6)   Transfer of Assets and Other Events
      -----------------------------------

      On  October 31, 1997, Westinghouse de Puerto Rico, Inc., with
          approximately 760 plan participants, was sold to Ingersoll-Rand
          Company. In accordance with the purchase agreement, assets equal to
          the October 31, 1997, account balances of the Company's employees were
          transferred to a plan sponsored by Thermo King de Puerto Rico, Inc.
          Such transfer did not occur until subsequent to December 31, 1997,
          and, accordingly, the December 31, 1997, market value of these assets
          by fund are listed below:
<TABLE>

<S>                                                                                              <C>         
                  Fixed Income Fund                                                              $  2,474,304
                  Vanguard Mutual Fund                                                                733,029
                  Fidelity Growth and Income Fund                                                     137,375
                  CBS Common Stock Fund                                                               235,233
                  Loan Fund                                                                           383,915
                                                                                                 ------------
                                                                                                 $  3,963,856
                                                                                                 ============
</TABLE>

      The above amounts, which represent Plan assets to be transferred to other
          plans, have been recorded as liabilities on the statement of net
          assets available for benefits as of December 31, 1997.

      On  March 1, 1996, the Productos Electronicos Industriales Division (PEI),
          with approximately 253 plan participants, was sold to Northrop Grumman
          Corporation. In accordance with the purchase agreement, assets equal
          to the March 31, 1996 account balances of PEI employees were
          transferred to a plan sponsored by Northrop Grumman Corporation. Such
          transfer did not occur until subsequent to December 31, 1996, and,
          accordingly, the December 31, 1996, market value of these assets by
          fund are listed below.
<TABLE>

<S>                                                                                                 <C>
                  Fixed Income Fund                                                                 $  522,322
                  Vanguard Mutual Fund                                                                 120,395
                  CBS Common Stock Fund                                                                 38,694
                                                                                                    ----------
                                                                                                    $  681,411
                                                                                                    ==========

</TABLE>

      The above amounts, which represent Plan assets to be transferred to other
          plans, have been recorded as liabilities on the statement of net
          assets available for benefits as of December 31, 1996.

                                                                     (Continued)

                                       12
<PAGE>   16


                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                    Notes to Financial Statements, Continued


      On  September 30, 1996, the Productos Circuitos de Puerto Rico Division
          was sold to Productos Circuitos de Puerto Rico P.R., Inc., and, on
          November 30, 1996, the Wittnauer International Division was sold to
          Composite Holdings L.L.C. In addition, two other facilities were
          closed as of December 31, 1996: the Computer and Instrumentation
          Division (CIPR) and Westinghouse Electric Company, S.A. - Power
          Generation. Assets equal to the account balances of the affected
          employees were distributed to participants subsequent to December 31,
          1996. The December 31, 1996 market value of these assets by fund was
          as follows:
<TABLE>

<S>                                                                                          <C>          
               Fixed Income Fund                                                             $     875,615
               Vanguard Mutual Fund                                                                315,622
               CBS Common Stock Fund                                                                79,628
                                                                                               -----------
                                                                                              $  1,270,865
                                                                                              ============
</TABLE>

      The above amounts, which represent Plan assets to be distributed directly
          to participants, have not been recorded as liabilities on the
          statement of net assets available for benefits as of December 31,
          1996, since benefits are recorded when paid.

                                       13

<PAGE>   17


                                                                      Schedule 1
                                                                      ----------
                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                                 EIN: 25-1202929

                                Plan Number: 007

          Line 27(a) - Schedule of Assets Held for Investment Purposes

                                December 31, 1997
<TABLE>
<CAPTION>

Column A              Column B                                  Column C                            Column D            Column E
- --------              --------                                  --------                            --------            --------

                                                   Description of investment including                                 Current/
         Identity of issue, borrower, lessor        maturity date, rate of interest,                                   contract
                  or similar party                  collateral, par or maturity value                 Cost               value
                  ----------------                  ---------------------------------                 ----               -----
<S>                                            <C>                                               <C>                   <C>
                                               Registered investment companies:
           Vanguard Group                          Vanguard Index Trust 500 Portfolio -
                                                        9,144 shares                             $   823,944             823,578

           Fidelity Investments                    Fidelity Growth and Income Fund -
                                                        4,111 shares                                 147,100             156,626

     *     CBS Corporation                     Common stock - 11,439 shares                          186,819             336,741

     *     Bankers Trust Company               BT Pyramid Directed Cash Fund                              31                  31

     *     Participant loans                   Participant loans with interest rates of 9.5%
                                                   and various maturity dates through 2002                 0(1)          384,427
                                                                                                 -----------           ---------
                                                                                                  $1,157,894           1,701,403
                                                                                                  ==========           =========
</TABLE>

* -   Party-in-interest

(1)   The cost of participant loans is $-0- as provided for in the instructions
      to the Form 5500 - Line 27(a)

                                       14

<PAGE>   18



                                                                      Schedule 2
                                                                      ----------

                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                                 EIN: 25-1202929

                                Plan Number: 007

                Line 27(d) - Schedule of Reportable Transactions

                          Year Ended December 31, 1997


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
Single Transactions Involving an Amount in Excess of Five Percent of the Current Value of Plan Assets

   Column A                    Column B                            Column C   Column D  Column G    Column H    Column I
   --------                    --------                            --------   --------  --------    --------    --------

                                                                                                  Current value
                                                                                                   of asset on
  Identity of                                                      Purchase    Selling   Cost of   transaction   Net gain
 party involved           Description of asset                        price      price     asset       date       (loss)
 --------------           --------------------                        -----      -----     -----       ----       ------

<S>                     <C>                                        <C>         <C>        <C>        <C>          <C>    
                        Registered investment companies:
Vanguard Group               Vanguard Institutional Index Fund     $        -  823,944    570,355    823,944      253,589
                                                                            -  156,817    108,165    156,817       48,652
                                                                            -  115,191     83,735    115,191       31,456
                                                                            -  108,000     78,091    108,000       29,909
                                                                       79,425        -     79,425     79,425          N/A

Vanguard Group          Vanguard Index Trust 500 Portfolio            823,944        -    823,944    823,944          N/A

CBS Corporation         Common stock                                        -   74,313     46,831     74,313       27,482
</TABLE>

                                                                     (Continued)

                                       15
<PAGE>   19


                                                           Schedule 2, Continued
                                                           ---------------------

                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                                 EIN: 25-1202929

                                Plan Number: 007

           Line 27(d) - Schedule of Reportable Transactions, Continued
<TABLE>
<CAPTION>


- ------------------------------------------------------------------------------------------------------------------------
Single Transactions Involving an Amount in Excess of Five Percent of the Current Value of Plan Assets

    Column A                    Column B                Column C      Column D     Column G          Column H           Column I
    --------                    --------                --------      --------     --------          --------           --------

                                                                                                    Current value
                                                                                                     of asset on
    Identity of                                          Purchase       Selling      Cost of         transaction         Net gain
  party involved           Description of asset            price         price        asset             date              (loss)
  --------------           --------------------            -----         -----        -----             ----              ------

<S>                     <C>                               <C>             <C>          <C>              <C>                     
Bankers Trust Company   BT Pyramid Directed Cash Fund     $       -       125,004      125,004          125,004                -
                                                             115,191            -      115,191          115,191              N/A
                                                              79,425            -       79,425           79,425              N/A
                                                                   -       79,425       79,425           79,425                -
                                                             111,889            -      111,889          111,889              N/A
                                                              95,975            -       95,975           95,975              N/A
                                                                   -       89,257       89,257           89,257                -
                                                                   -       76,173       76,173           76,173                -
                                                              74,313            -       74,313           74,313              N/A
</TABLE>


Note 1: Columns E (Lease/Rental) and F (Expense Incurred With Transaction) have
been omitted because there is no information to report.

                                                                     (Continued)

                                       16
<PAGE>   20


                                                           Schedule 2, Continued
                                                           ---------------------

                        WESTINGHOUSE DE PUERTO RICO, INC.
                             RETIREMENT SAVINGS PLAN

                                 EIN: 25-1202929

                                Plan Number: 007

           Line 27(d) - Schedule of Reportable Transactions, Continued

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
Series Transactions, When Aggregated, Involving an Amount in Excess of Five Percent of the Current Value of Plan Assets

                                                                       Number      Number   Total dollar      Total dollar
   Identity of                                                          of          of       value of          value of     Net gain
 party involved                 Description of asset                purchases     sales     purchases           sales        (loss)
 --------------                 --------------------                ---------     -----     ---------           -----        ------

<S>                      <C>                                           <C>        <C>      <C>               <C>             <C>    
                         Registered investment companies:
Vanguard Group                Vanguard Institutional Index Fund        22         13       $  266,366        1,396,014       422,942

Vanguard Group           Vanguard Index Trust 500 Portfolio             1          -          823,944                -           N/A

CBS Corporation          Common stock                                   -          8                -          265,158        76,862

Bankers Trust Company    BT Pyramid Directed Cash Fund                 54         38          783,160          791,711             -
</TABLE>

                                       17
<PAGE>   21

                                    SIGNATURE

  Pursuant to the requirements of the Securities Exchange Act of 1934, the Plan
 Administrator has duly caused this annual report to be signed on behalf of the
               Plan by the undersigned thereunto duly authorized.


                       Westinghouse de Puerto Rico, Inc. Retirement Savings Plan


Dated:  June 26, 1998                                     By: /s/ A. G. Ambrosio
                                                             -------------------
                                                            Name: A. G. Ambrosio
                                                       Title: Plan Administrator


<PAGE>   22
                                  EXHIBIT INDEX


                  Exhibit No.                 Description

                  23                Consent of KPMG Peat Marwick LLP



<PAGE>   1
                                   EXHIBIT 23

                         Consent of Independent Auditors
                            ------------------------

We consent to the incorporation by reference in the Registration Statement on
Form S-8 (No. 33-44044) of our report dated June 5, 1998, included in the Annual
Report of the Westinghouse de Puerto Rico, Inc. Retirement Savings Plan on Form
11-K for the year ended December 31, 1997.


                                                       /s/ KPMG PEAT MARWICK LLP
                                                           ---------------------
                                                        Pittsburgh, Pennsylvania

                                                                   June 26, 1998





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