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,
Holborn tube station 2–6 minutes from approximately 05:53 to 00:30 westbound and 05:51 to 00:33 eastbound. Piccadilly line trains operate every 2–6 minutes from approximately 05:42 to 00:28 westbound and 05:54 to 00:38 northbound. On the Central line 1992 Stock is used. On the Piccadilly line 1973 Stock is used. Before the closure of the original London tram network in 1952, Holborn tube station provided an interchange between trams and tubes, via the Kingsway Tramway Subway underground Holborn tramway station located a little distance south of the underground station. This was the only part of London with an underground tram system, and Holborn