Liverpool Street tube station is the fifth busiest station on the London Underground network with four lines passing through: three sub-surface and one deep-level. The station is served by the Central, Circle, Hammersmith & City and Metropolitan lines.
The station has sub-surface platforms (opened by the Metropolitan Railway as "Bishopsgate" on 12 July 1875) on the Circle, Metropolitan and Hammersmith & City lines. The Metropolitan had served mainline platforms of the GER station from 1 February 1875, but this through-link had only a short life. The station was renamed Liverpool Street from 1 November 1909. A disused west-facing bay platform once used by terminating Metropolitan and occasional District line trains running via Edgware Road is still visible.
The deep-level Central line platforms opened on 28 July 1912, as the new eastern terminus of the Central London Railway. The line was extended eastwards, as part of the Second World War-delayed London Passenger Transport Board's "New Works Programme 1935–1940", on 4 December 1946. The platforms were not re-numbered after the closure of the bay platform, resulting in the station having platforms numbered 1 and 2 on the sub-surface lines, 4 and 5 on the Central line.
Only the eastbound/clockwise (Aldgate/Barking) platform of the Circle line is wheelchair accessible. Wheelchair users wishing to travel in the Hammersmith/Uxbridge direction must take a train that terminates at Aldgate or Whitechapel and stay on it as it starts its westbound journey; when coming from Aldgate/Barking, they must continue to King's Cross St. Pancras to change direction. Some stations on the eastern section of the Central line are wheelchair accessible from here by changing at Mile End.