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                                                                    EXHIBIT 99.5

                             NOTICE TO PARTICIPANTS
                                     IN THE
                         WESTINGHOUSE AIR BRAKE COMPANY
                                RAC VOTING TRUST

Dear Voting Trust Participant:

     Enclosed with this notice is a Joint Proxy Statement/Prospectus for the
Special Meeting of Stockholders which will be held on August 23, 1999. The
Special Meeting is being called for the purpose of the approval and adoption of
the Agreement and Plan of Merger dated as of June 2, 1999, as amended, between
the Company and MotivePower Industries, Inc. and the merger, as well as
considering any other matters that may properly come before the Special Meeting.

     As a Voting Trust Participant and stockholder you are cordially invited to
attend the Special Meeting. As you know, by the terms of the Second Amended
WABCO Voting Trust/Disposition Agreement dated as of December 13, 1995 by which
we deposited our shares in the Voting Trust, we agreed that the Trustees of the
Voting Trust will be responsible for voting the shares we have delivered to the
Trust. Accordingly, a proxy card has not been included with the enclosed
materials.

     Thank you for your continued cooperation and for your faith in the success
of our joint efforts.

                                          Sincerely,

                                          William E. Kassling
                                          Chairman and Chief Executive Officer