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,
Canary Wharf tube station Canary Wharf tube station Canary Wharf is a London Underground station in the Canary Wharf commercial estate; it is on the Jubilee line, between and . The station, located in Travelcard Zone 2 and was opened by then-Mayor of London Ken Livingstone setting an escalator in motion on 17 September 1999 as part of the Jubilee Line Extension. Over 40 million people pass through the station each year, making it second busiest on the London Underground outside Central London after Stratford, and also the busiest that serves only a single line. Before the arrival of the Jubilee line, London's Docklands