exempt vehiclemeans a rail vehicle known as Victoria Line 2009 Tube Stock (09TS) and with a number in the series 11001 to 11094, 12001 to 12094, 13001 to 13094 or 14001 to 14094;
step-free accessmeans access from the station entrance to platform level without the use of stairs or escalators;
Victoria Linemeans the London Underground route between Walthamstow Central and Brixton stations.