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,
Clapham North tube station the parapet walls. In turn, the station's corner entrance block was reclad in post-modern style tiles in c1996, the lower side wings retain their 1920s elevations. The station's name was changed to Clapham North on 13 September 1926 after the line was extended to Morden that year. Clapham North is one of eight London Underground stations which has a deep-level air-raid shelter beneath it. London Buses routes 50, 88, 155, 322, 345, P5 and night route N155 serve the station. Clapham North tube station Clapham North is an Underground station in Clapham, London. It is on the Northern line between