UNITED STATES
                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549


                                     SCHEDULE 13G


                      Under the Securities Exchange Act of 1934
                                  (Amendment No. 4)


                                   L.B. Foster Co.
          -----------------------------------------------------------------
                                   (Name of Issuer)

                                    Common Shares
          -----------------------------------------------------------------
                            (Title of Class of Securities)

                                      350060109
          -----------------------------------------------------------------
                                    (CUSIP Number)

          -
          *The remainder of this cover page shall be filled out for a
          reporting person's initial filing on this form with respect to
          the subject class of securities, and for any subsequent amendment
          containing information which would alter the disclosures provided
          in a prior cover page.  

          The information required in the remainder of this cover page
          shall not be deemed to be "filed" for the purpose of Section 18
          of the Securities Exchange Act of 1934 ("Act") or otherwise
          subject to the liabilities of that section of the Act but shall
          be subject to all other provisions of the Act (however, see the
          Notes).

















                                  Page 1 of 4 Pages


                                     SCHEDULE 13G

          CUSIP No. 350060109                          Page  2  of 4 Pages

          1    NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               Quaker Capital Management Corporation
               -------------------------------------

          2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)    
                                                                     ---

                                                                 (b)  X
                                                                     ---
          3    SEC USE ONLY

          4    CITIZENSHIP OR PLACE OF ORGANIZATION

                    Pennsylvania
                    ------------

             NUMBER OF             5  SOLE VOTING POWER          179,500
               SHARES
            BENEFICIALLY           6  SHARED VOTING POWER        460,200
              OWNED BY
                EACH               7  SOLE DISPOSITIVE POWER     179,500
             REPORTING
               PERSON              8  SHARED DISPOSITIVE POWER   460,200
                WITH

          9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    639,700
                    -------
          10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
               CERTAIN SHARES   
                              ------

               The Reporting Person disclaims beneficial ownership of
               460,200 shares owned by its clients.


          11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                    6.42%
                    -----

          12   TYPE OF REPORTING PERSON*

                    IA
                   ----

                                  Page 2 of 4 Pages


                           AMENDMENT NO. 4 TO SCHEDULE 13G
                                 CUSIP NO. 350060109

                    This constitutes Amendment No. 4 to the Schedule 13G of
          Quaker Capital Management Corporation filed with the Securities
          and Exchange Commission on February 5, 1993 relating to the
          Common Stock of L.B. Foster Co., as amended by Amendment No. 1
          filed with the Commission on February 10, 1994, Amendment No. 2
          filed with the Commission on February 14, 1995 and Amendment No. 
          3 filed with the Commission on February 15, 1996 (the "Schedule
          13G").

          Item 4 of the Schedule 13G is hereby amended and restated to read
          in its entirety as follows:

          Item 4.   Ownership
                    ---------

                    (a)  The Reporting Person, in its capacity as
                         investment adviser, may be deemed to be the
                         beneficial owner of 460,200 shares of the Common
                         Stock of the Issuer which are owned by various
                         investment advisory clients of the Reporting
                         Person in accounts over which the Reporting Person
                         has discretionary authority.  The filing of this
                         report shall not be construed as an admission that
                         the Reporting Person is, for purposes of Section
                         13(d) or 13(g) of the Act, the beneficial owner of
                         these securities.  Additionally, the Reporting
                         Person and/or its principals own 179,500 shares of
                         the Common Stock of the Issuer.

                    (b)  The shares covered by this report represent 6.42% 
                         of the Common Stock of the Issuer.

                    (c)  None of the clients of the Reporting Person is
                         known to own more than 5% of the Common Stock of
                         the Issuer.  The Reporting Person shares voting
                         and dispositive power over the 460,200 shares
                         owned by its clients and held in accounts over
                         which it has discretionary authority.  The
                         Reporting Person and/or its principals have sole
                         voting and dispositive power over the 179,500
                         shares owned by the Reporting Person and/or its
                         principals.

          Item 6 of the Schedule 13G is hereby amended and restated to read
          in its entirety as follows:







                                 Page 3 of 4 Pages


          Item 6.   Ownership of More than Five Percent on 
                    Behalf of Another Person
                    --------------------------------------

                    460,200 of the shares with respect to which this report
                    is filed are owned by a variety of investment advisory 
                    clients of the Reporting Person, which clients are
                    entitled to receive dividends on and the proceeds from 
                    the sale of such shares.  No client is known to own
                    more than 5% of the class.


                                           SIGNATURE

          After reasonable inquiry and to the best of my knowledge and
          belief, I certify that the information set forth in this
          statement is true, complete and correct.


                                   QUAKER CAPITAL MANAGEMENT CORPORATION




          February 11, 1997             By: /s/Mark G. Schoeppner
                                            -------------------------------
                                            Mark G. Schoeppner
                                            President

























                                  Page 4 of 4 Pages