Old Street station is a National Rail and London Underground interchange station in Islington, London, at the junction of Old Street and City Road, just outside of the City of London. It is in Travelcard Zone 1. On the National Rail network it is on the Northern City Line, 45 chains down-line from Moorgate, and is served by Great Northern. Although a through-station on this route, for ticketing purposes Old Street is considered a central London terminus.