London Underground and the mechanisms are regularly degreased to lower the potential for fires. The only wooden escalator not to be replaced was at Greenford station, which remained until October 2015 when TfL replaced it with the first incline lift on the UK transport network. There are 426 escalators on the London Underground system and the longest, at , is at Angel. The shortest, at Stratford, gives a vertical rise of . There are 184 lifts, and numbers have increased in recent years because of investment making tube stations accessible. Over 28 stations will have lifts installed over the next 10 years,
Stockwell tube station Stockwell tube station Stockwell is a London Underground station in Stockwell in the London Borough of Lambeth. It is located on the Northern line between Oval and Clapham North stations, and on the Victoria line between Brixton and Vauxhall stations. It is in Travelcard Zone 2. The station opened in 1890 as the southern terminus of the City & South London Railway, the first deep-level tube in London. The Victoria interchange opened in 1971 when that line was extended south from Victoria towards Brixton. The station is known for its World War II air-raid shelters, and for being the location