Circle line (London Underground) with the other London Underground sub-surface lines: the Hammersmith & City line from Hammersmith to just before Aldgate; the Metropolitan line from Baker Street to Aldgate; and the District line from Tower Hill station to Edgware Road station. The line is electrified with a four-rail DC system: a central conductor rail is energised at and a rail outside the running rail at , giving a potential difference of . The running rails are not electrified. Much of the double track railway from the Hammersmith terminus to Westbourne Park station is on a high brick viaduct. East of Westbourne Park the
Wimbledon station taking over the West Anglia Main Line north of there). This would provide another set of transport links for the area and direct services to and . There is also a proposal for an extension of the Tramlink services running from Wimbledon to Sutton via Morden, St. Helier and Rose Hill. The typical off-peak service (Monday to Saturday) frequency is: National Rail London Underground Wimbledon station Wimbledon is a National Rail, London Underground, and Tramlink station located on Wimbledon Bridge, Wimbledon in London, and is the only London station that provides an interchange between main line rail, Underground, and Tramlink.