Barbican tube station is a London Underground station in the City of London, known by various names since it opened in 1865. It takes its current name from the nearby Barbican Estate and Barbican Centre. The station is served by the Circle, Hammersmith & City and Metropolitan lines, and is situated between Farringdon and Moorgate stations, in fare zone 1. Until 2009, Barbican was additionally served by Thameslink services to and from Moorgate.
Barbican tube station lies in an east-west-aligned trench with cut-and-cover tunnels at either end. The modern entrance gives access from Aldersgate Street, through a 1990s building, to a much older footbridge leading to the eastern end of the platforms. Aldersgate Street is where the station has always stood; the street itself took its name from Aldersgate, a gate in the old London Wall. To the north of the station are the rears of buildings that face onto Charterhouse Street, Charterhouse Square and Carthusian Street. To the south are the rears of buildings that face onto Long Lane, and to the west is Hayne Street. The station is close to the Barbican Estate, Barbican Centre, City of London School for Girls, St Bartholomew-the-Great, and Smithfield.
The station is mostly open to the elements, though there are some short canopies. The remains of the supporting structure for a glass canopy over all four platforms (removed in the 1950s) may still clearly be seen. At the west end of the central island is a disused signal box. Also from this end of the platforms may be seen the beginnings of the complex of tunnels leading under Smithfield meat market. Livestock for the market was at one time delivered by rail and there was a substantial goods yard under the site. Platform 1 is the most northerly, serving eastbound trains. Platforms 2 and 3 form an island platform, with platform 2 serving westbound services. Platforms 3 and 4 are not used.