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(11)

EP 0 631 549 A1

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(43) Date of publication: 04.01.1995 Bulletin 1995/01 (21) Application number: 93908411.0 (22) Date of filing: 18.03.1993

(51) International Patent Classification (IPC):  B60L 15/ 42( . ) B61L 15/ 00( . ) (86) International application number: PCT/US1993/002503 (87) International publication number: WO 1993/018952 (30.09.1993 Gazette 1993/24)

(84) Designated Contracting States: DE GB (30) Priority: 18.03.1992 US 19920853186 (71) Applicant: AEG TRANSPORTATION SYSTEMS, INC. Pittsburgh, PA 15236-1491 (US)	(72) Inventors: WESLING, Henry, J. Pittsburgh, PA 15227 (US) NOVAKOVICH, Michael, R. Clairton, PA 15025 (US) ROBERTS, Richard, D. Elizabeth, PA 15037 (US) (74) Representative: Vogl, Leo, Dipl.-Ing.  Licentia Patent-Verwaltungs-G.m.b.H. Theodor-Stern-Kai 1 D-60596 Frankfurt D-60596 Frankfurt (DE)