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,
Northolt tube station the number of accessible stations on the Tube. North of the Central line tracks there is the singled track of the Acton–Northolt line from Paddington which now is used by freight trains and a single daily passenger "parliamentary service" (operated by Chiltern Railways) between Paddington and Gerrards Cross. There are no longer any platforms on this line. London bus routes 90, 120, 140, 282, 395, E10 and night route N7. Northolt tube station Northolt is a station on the London Underground Central line in Northolt in the London Borough of Ealing. It is in Travelcard Zone 5 and between Greenford