The last London Underground services ran in October 1975 and British Rail services commenced in August 1976, replacing services to Broad Street via the city branch of the North London Line. These British Rail services used the name "Great Northern Electrics". The track and tunnels are now owned by Network Rail. Services are provided by Great Northern to and, via the Hertford Loop Line, to (with some extending to Stevenage, Hitchin or Letchworth). The name "Northern City Line" has been revived to refer to the underground part of the route.