As filed with the Securities and Exchange Commission on January 17, 2006
                                                      Registration No. 333-50452
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                            -------------------------
                   POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                          ----------------------------

                                 CBS CORPORATION
             (Exact name of registrant as specified in its charter)

             Delaware                                      04-2949533
    (State or other jurisdiction of                      (I.R.S. Employer
    incorporation or organization)                        Identification No.)

                  51 West 52nd Street, New York, New York 10019
                                 (212) 975-4321
  (Address and phone number of principal executive offices, including zip code)
                          -----------------------------

           Infinity Broadcasting Corporation Stock Plan for Directors
         Infinity Broadcasting Corporation 1998 Long-Term Incentive Plan
         Infinity Broadcasting Corporation 1999 Long-Term Incentive Plan
                     Outdoor Systems, Inc. 1996 Omnibus Plan


                            (Full title of the plans)

                             Louis J. Briskman, Esq.
                  Executive Vice President and General Counsel
         CBS Corporation, 51 West 52nd Street, New York, New York 10019
                                 (212) 975-4321
            (Name, address and telephone number of agent for service)
                            -------------------------










                                EXPLANATORY NOTE

     CBS Corporation, a Delaware corporation (the "Registrant"), is filing with
the Securities and Exchange Commission this Post-Effective Amendment No. 1 to
its Registration Statement on Form S-8 (File No. 333-50452) (the "Registration
Statement"), which Registration Statment is Post-Effective Amendment No. 3 to
the Registrant's Registration Statement on Form S-4 (File No. 333-50452), as a
result of the merger (the "Merger") of Viacom Merger Sub Inc., a Delaware
corporation, with and into the Registrant on December 31, 2005, with the
Registrant as the surviving corporation of the Merger. Upon completion of the
Merger, the name of the Registrant was changed from "Viacom Inc." to "CBS
Corporation." This Post-Effective Amendment No. 1 is filed to reflect (i) the
change in the name of the Registrant, (ii) a reduction in the par value of the
Registrant's Class B Common Stock registered under the Registration Statement
from $0.01 to $0.001 per share, (iii) the removal of the Outdoor Systems, Inc.
1996 Non-Employee Directors Stock Option Plan, which was originally included on
the Registration Statement and (iv) the removal of the Infinity Broadcasting
Corporation Employees' 401(k) Plan, the Infinity Broadcasting Corporation
Employees' 401(k) Union Plan, the Outdoor System, Inc. 401(k) Plan and the CBS
Employee Investment Fund, which subsequent to the original filing of this
Registration Statement were merged into the CBS Corporation 401(k) Plan
(formerly known as the Viacom Inc. 401(k) Plan), pursuant to which shares of the
Registrant are being offered under the Registrant's Registration Statement filed
on February 8, 2002 (File No. 333-82422).







                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Post-Effective
Amendment No. 1 to Registration Statement No. 333-50452 on Form S-8 to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of New
York, State of New York, on the 17th day of January, 2006.

                                     CBS CORPORATION



                                     By: /s/ Angeline C. Straka
                                         ---------------------------------------
                                         Name:  Angeline C. Straka
                                         Title: Senior Vice President, Deputy
                                                General Counsel and Secretary

     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 1 to Registration Statement No. 333-50452 on Form
S-8 has been signed by the following persons in the capacities indicated on the
17th day of January, 2006.

Signature                                           Title

*                                            Director, President and
-------------------------------              Chief Executive Officer
    Leslie Moonves                           (Principal Executive Officer)


*                                            Executive Vice President
-------------------------------              and Chief Financial Officer
    Fredric G. Reynolds                      (Principal Financial Officer)


/s/ Susan C. Gordon                          Senior Vice President,
-------------------------------              Controller and Chief
    Susan C. Gordon                          Accounting Officer
                                             (Principal Accounting Officer)

*                                            Director
-------------------------------
    David R. Andelman


*                                            Director
-------------------------------
    Joseph A. Califano, Jr.



*                                            Director
-------------------------------
    William S. Cohen




*                                            Director
-------------------------------
    Philippe P. Dauman


*                                            Vice Chair and Director
-------------------------------
    Shari Redstone


*                                            Chairman and Director
-------------------------------
    Sumner M. Redstone

*                                            Director
-------------------------------
    Robert D. Walter




 *By:   /s/ Angeline C. Straka
     ------------------------------------------
       Angeline C. Straka, Attorney-in-Fact              January 17, 2006





                                  Exhibit Index

Exhibit No.       Description of Document

4.1*              Form of Amended and Restated Certificate of Incorporation of
                  the Registrant (incorporated by reference to Exhibit 3.3 to
                  the Registrant's Registration Statement on Form S-4 as amended
                  (File No. 333-128821) filed on November 23, 2005).

4.2*              Form of Amended and Restated By-laws of the Registrant
                  (incorporated by reference to Exhibit 3.4 to the
                  Registrant's Registration Statement on Form S-4 as amended
                  (File No. 333-128821) filed on November 23, 2005).

4.3*              Agreement and Plan of Merger, dated as of October 30, 2000
                  among Viacom Inc., IBC Merger Corp. and Infinity
                  Broadcasting Corporation (incorporated by reference to the
                  Registration Statement on Form S-4 filed by Viacom Inc. on
                  November 22, 2000 (File No. 333-50452), as amended
                  by Amendment No. 1 to Form S-4 filed by Viacom Inc. on
                  January 1, 2001 and Amendment No. 2 to Form S-4 filed by
                  Viacom Inc. on January 12, 2001).

4.4*              Infinity Broadcasting Corporation Stock Plan for Directors
                  (Effective as of February 24, 2000) (incorporated by reference
                  to Exhibit 10(aa)(ii) to the Annual Report on Form 10-K of the
                  Registrant for the fiscal year ended December 31, 2002 (File
                  No. 001-9553)).

4.5*              Infinity Broadcasting Corporation 1999 Long-Term Incentive
                  Plan.

4.6*              Infinity Broadcasting Corporation 1998 Long-Term Incentive
                  Plan (incorporated by reference to Exhibit 10.16 to Form 10-K
                  filed by Infinity for the year ended December 31, 1999 (File
                  No. 001-14599)).

4.7*              Outdoor Systems, Inc. 1996 Omnibus Plan (incorporated by
                  reference to Exhibit 10.16 to Form S-1 filed by Outdoor
                  Systems, Inc. on February 22, 1996 (File No. 333-01582)).

5.1*              Opinion of Michael D. Fricklas, Esq. as to the legality of the
                  securities being registered (incorporated by reference to
                  the Registration Statement on Form S-4 filed by the
                  Registrant on November 22, 2000 (File No. 333-50452), as
                  amended by Amendment No. 1 to Form S-4 filed by the
                  Registrant on January 9, 2001 and Amendment No. 2 to Form
                  S-4 filed by the Registrant on January 12, 2001).

23.1*             Consent of PricewaterhouseCoopers LLP.

23.2*             Consent of KPMG LLP.

23.3*             Consent of Mitchell & Titus, LLP.

23.4*             Consent of Michael D. Fricklas, Esq.



24**              Powers of Attorney.


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*  Previously filed or incorporated by reference in this Registration Statement.
** Filed herewith.