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,
Tower of London tube station 1884 with the name Mark Lane (later renamed Tower Hill), just to the west of the Tower of London station, which closed on 12 October. When the original Tower Hill station was itself closed in 1967, the current Tower Hill station was opened on the site of the closed Tower of London station. The remains of the Tower of London station were demolished during the construction of the new Tower Hill station. Tower of London tube station Tower of London was a London Underground station in the City of London that closed in 1884, only two years after opening. It