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 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 was situated near the Tower of London, on a site now occupied by Tower Hill Underground station. It was opened on 25 September 1882 during the construction of the Metropolitan Railway (MR) to the north. Two years later, the MR and District Railway (now the District line) were connected to form the Inner Circle (now the Circle line) and a new station was built. This new station was opened on 6 October