(19)

(11)

EP 1 322 512 A2

(12)

(88) Date of publication A3: 13.06.2002 (43) Date of publication: 02.07.2003 Bulletin 2003/27 (21) Application number: 01963278.5 (22) Date of filing: 10.09.2001

(51) International Patent Classification (IPC)7: B61L 25/00 (86) International application number: PCT/GB0104/037 (87) International publication number: WO 0202/6543 (04.04.2002 Gazette 2002/12)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 27.09.2000 GB 0023710 (71) Applicant: WESTINGHOUSE BRAKE ANDSIGNAL HOLDINGS LIMITED Chippenham,Wiltshire SN15 1RT (GB)	(72) Inventors: GEORGE, Terence, Malcolm Monmouth NP25 3JX (GB) THOMAS, Mark DownendBristol BS16 6BS (GB) (74) Representative: Newstead, Michael John et al Page HargraveSouthgateWhitefriarsLewins Mead Bristol BS1 2NT Bristol BS1 2NT (GB)