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,
Arsenal tube station narrow Victorian residential street, away from any main roads. It is also unusual in not having any bus routes pass its entrance, though routes 4, 19, 106 and 236 serve nearby Blackstock Road. Arsenal tube station was opened by the Great Northern, Piccadilly and Brompton Railway (GNP&BR) as Gillespie Road on 15 December 1906. The GNP&BR was later renamed the Piccadilly line after the consolidation and nationalisation of the Tube network as London Underground. The original station building and ticket hall were red terracotta-clad buildings designed by Leslie Green, similar to neighbouring stations such as Holloway Road and Caledonian Road.