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,
Cockfosters tube station and night route N91 serve the station. Cockfosters tube station Cockfosters is a London Underground station on the Piccadilly line for which it is the northern terminus. The station is located on Cockfosters Road (A111) approximately nine miles () from central London and serves Cockfosters in the London Borough of Barnet although it is actually located a short distance across the borough boundary in the neighbouring London Borough of Enfield. The station is in Travelcard Zone 5 and the next station south-east is Oakwood. The station opened on 31 July 1933, the last of the stations on the extension of