 By the mid-1980s, this equipment had ceased to be used, as works trains were only run on the Victoria line when engineers had possession of the whole line.Subsequently, some locomotives (L27–L32) have been fitted with a new type of Victoria line ATP equipment which was designed by Metronet BCV on behalf of Transplant, the operator of the fleet.This system was installed during 2007 at Ruislip Depot.