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 of the shooting of Jean Charles de Menezes. Stockwell station was ceremonially opened on 4 November 1890 by the Prince of Wales (later King Edward VII), as the most southerly station on the City & South London Railway (C&SLR) – London's first deep-level tube railway. Passenger services began just over one month later on 18 December. The station was built with a single island platform with tracks on either side, an arrangement rarely used underground on the network, but which exists today at Clapham North and Clapham Common. Stockwell's original platform was further north than the new ones, and trains