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,
Grange Hill tube station Hainault. Since 5 February 2006 this has been one of the small number of stations on the network to have no staffed ticket office. However, staff are available 24 hours a day for customer information and the train service has been extended to midnight to take into account the rising passenger numbers. Typical off-peak services are: London Buses routes 362 and 462 and Local School route 43 Times serve the station. Grange Hill tube station Grange Hill is a London Underground station on the Central line which lies in the parish of Chigwell in the Epping Forest district of Essex.