(19)

(11)

EP 0 076 286 A1

(12)

(43) Date of publication: 13.04.1983 Bulletin 1983/15 (21) Application number: 82900985.0 (22) Date of filing: 13.04.1982

(51) International Patent Classification (IPC):  B61L 5/ 02( . ) (86) International application number: PCT/GB1982/000113 (87) International publication number: WO 1982/003607 (28.10.1982 Gazette 1982/26)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 13.04.1981 GB 19810011664 (71) Applicant: THOS. W. WARD (RAILWAY ENGINEERS) LTD Sandiacre Nottingham NG10 5AN (GB)	(72) Inventor: HANCOCK, James Justinian Wymondham, Leicestershire (GB) (74) Representative: Orr, William McLean, et al  Haseltine Lake & Co Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)