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,
Southwark tube station Southwark tube station Southwark is a London Underground station in the London Borough of Southwark at the corner of Blackfriars Road and The Cut. It is between and stations on the Jubilee line, and is in Travelcard Zone 1. It was opened on 20 November 1999 as part of the Jubilee Line Extension. The station is somewhat west of historic Southwark, which is served by Borough and London Bridge stations. Its entrance is across the road from the disused Blackfriars Road railway station. The original plan for the Extension did not include a station between those at Waterloo and London