The tube station is on the Bank branch of the Northern Line between Old Street and Bank, and also on the Circle, Hammersmith and City and Metropolitan lines, between Barbican and Liverpool Street. The station is in zone 1.
The mainline station is served by Thameslink and West Anglia Great Northern. WAGN trains arrive at deep-level tube platforms via the Northern City Line route, formerly part of the Underground.
On February 28, 1975 a Northern Line tube train (on the Northern City Line now used by WAGN) crashed killing 43 people.