(19)

(11)

EP 0 694 169 A1

(12)

(43) Date of publication: 31.01.1996 Bulletin 1996/05 (21) Application number: 92923334.0 (22) Date of filing: 26.10.1992

(51) International Patent Classification (IPC):  G01R 31/ 06( . ) G01R 31/ 327( . ) (86) International application number: PCT/US1992/009055 (87) International publication number: WO 1994/010578 (11.05.1994 Gazette 1994/11)

(84) Designated Contracting States: ES GB IT NL (71) Applicant: GENERAL RAILWAY SIGNAL CORP. Rochester, NY 14602-0600 (US)	(72) Inventors: THEE, Michael Aurora, CO 80010 (US) SHURMANTINE, William c/o Continental Testing, Inc. Colorado, 80011 (US) (74) Representative: Wood, Anthony Charles, et al  Urquhart-Dykes & Lord 91 Wimpole Street London W1M 8AH London W1M 8AH (GB)