(19)

(11)

EP 1 012 023 A1

(12)

(43) Date of publication: 28.06.2000 Bulletin 2000/26 (21) Application number: 98940445.4 (22) Date of filing: 01.09.1998

(51) International Patent Classification (IPC)7: B61L 5/18, G08G 1/095, F21Q 3/00 (86) International application number: PCT/GB9802/620 (87) International publication number: WO 9911/498 (11.03.1999 Gazette 1999/10)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 04.09.1997 GB 9718643 24.10.1997 GB 9722368 (71) Applicant: Howells Railway Products Limited Wythenshawe,Manchester M22 4SS (GB)	(72) Inventors: HOWELLS, David Peter Sale,Manchester M33 3PL (GB) HOWELLS, Michael Wythenshawe,Manchester M22 4ZQ (GB) (74) Representative: Dodd, David Michael  TNP Services,5 Half Edge Lane,Eccles Manchester M30 9GJ Manchester M30 9GJ (GB)