Wimbledon is a National Rail, London Underground, and Tramlink station located on Wimbledon Bridge, Wimbledon in London, and is the only station in London that provides an interchange between the London Underground and Tramlink. The station serves as a junction for services from the Underground's District line and National Rail operators (South Western Railway and Thameslink), as well as Tramlink services. The station is in Travelcard Zone 3. It is from on the South West Main Line. The station has 11 platforms. Platforms 1–4 are for London Underground, platforms 5 and 8 are for inner suburban South Western Railway services, platform 9 is for Thameslink and platforms 10a and 10b are for Tramlink. Platforms 6 and 7 are adjacent to the fast tracks intended for express and outer suburban South Western Railway services, but most of these services only call at Wimbledon during the Wimbledon Tennis Championships or on Sundays for outer suburban services. Access to these platforms is via sliding gates through safety fencing installed in March 2014. The first railway station in Wimbledon was opened on 21 May 1838, when the London and South Western Railway (L&SWR) opened its line from its terminus at Nine Elms in Battersea to Woking. The original station was to the south of the current station on the opposite side of the Wimbledon Bridge. On 22 October 1855, the Wimbledon and Croydon Railway (W&CR) opened the West Croydon to Wimbledon Line to West Croydon via Mitcham and on 1 October 1868 the Tooting, Merton and Wimbledon Railway (TM&WR) opened a line to Streatham via Tooting Junction (now just Tooting). They shared a detached platform slightly to the southwest of the main LSWR station, until the whole station was relocated to the northeast of Wimbledon Bridge for the opening of the District Railway. On 3 June 1889, the District Railway (DR, now London Underground's District line) opened the LSWR-built extension of its line from Putney Bridge, making Wimbledon station the new terminus of that branch and providing Wimbledon with a direct connection to the developing London Underground system.