(19)

(11)

EP 1 552 062 A1

(12)

(43) Date of publication: 13.07.2005 Bulletin 2005/28 (21) Application number: 03753791.7 (22) Date of filing: 16.10.2003

(51) International Patent Classification (IPC)7: E01B 7/04, E01B 23/06, A63H 19/30 (86) International application number: PCT/GB2003/004449 (87) International publication number: WO 2004/035933 (29.04.2004 Gazette 2004/18)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 16.10.2002 GB 0224089 (71) Applicant: Balfour Beatty plc London SW1V 1LQ (GB)	(72) Inventor: TUNLEY, Malcom,Balfour Beatty Rail Ltd. Derby DE1 2SA (GB) (74) Representative: Ertl, Nicholas Justin et al Elkington and Fife LLP,Prospect House,8 Pembroke Road Sevenoaks,Kent TN13 1XR Sevenoaks,Kent TN13 1XR (GB)