(19)

(11)

EP 2 470 408 A1

(12)

(43) Date of publication: 04.07.2012 Bulletin 2012/27 (21) Application number: 11721085.6 (22) Date of filing: 28.04.2011

(51) International Patent Classification (IPC):  B61L 1/14(2006.01) B61L 27/00(2006.01) B61L 3/12(2006.01) B61L 25/02(2006.01) (86) International application number: PCT/GB2011/050842 (87) International publication number: WO 2011/135368 (03.11.2011 Gazette 2011/44)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 28.04.2010 GB 201007073 (71) Applicant: Westinghouse Brake and Signal Holdings Limited London Greater London SW1X 7AW (GB)	(72) Inventors: CHADWICK, Simon Wiltshire SN10 3JP (GB) TURNER, Kevin Wiltshire SN11 8SQ (GB) (74) Representative: Emerson, Peter James et al Page Hargrave Whitefriars Lewins Mead Bristol BS1 2NT Bristol BS1 2NT (GB)