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,
Osterley tube station grounds that it was a relatively quiet station and within one or two stops of an existing step-free station, Hounslow East where step-free access has been available since 2005. Osterley tube station Osterley () is a London Underground station in Osterley in west London. The station is on the Heathrow branch of the Piccadilly line, between Boston Manor and Hounslow East. The station is located on Great West Road (A4) close to the National Trust-owned Osterley Park. It is in Travelcard Zone 4. Osterley station was opened on 25 March 1934 adjacent to the Great West Road which had been