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,
Central–Mid-Levels escalator Central–Mid-Levels escalator The Central–Mid-Levels escalator and walkway system in Hong Kong is the longest outdoor covered escalator system in the world. The system covers over in distance and traverses an elevation of over from bottom to top. It opened in 1993 to provide an improved link between the Central and Mid-Levels districts on Hong Kong Island. As at November 2018, the top stage of the escalator between Robinson Road and Conduit Road has been replaced, and went operational on 11 July 2018. The escalator between Mosque and Robinson Roads is under refurbishment. Apart from serving as a mode of transportation,