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,
Redbridge tube station cut and cover) station on the network, as it is only beneath the surface. However, this is misleading as the station tunnel was constructed by the cut and cover method, with the running lines descending into genuine tube tunnels at either end of the platforms - similar to the Central line platforms at Mile End. In July 2011 it was granted Grade II listed building status by English Heritage. It was also mentioned in the Department S episode "The Last Train To Redbridge", although the actual station does not appear in it. London Buses routes 66, 145 and 366 serve