Southampton Central railway station is a main line station serving the city of Southampton in Hampshire, southern England. It is on the South West Main Line and also serves the Wessex Main Line and the West Coastway Line. The station is approached from the London direction by passing through Southampton Tunnel and is 79 miles 19 chains (127.5 km) measured from London Waterloo. It is the busiest station in Hampshire, and the fifth busiest in South East England.

The South West Main Line (SWML) is a 143-mile major railway line between Waterloo station in central London and Weymouth on the south coast of England. A predominantly passenger line, it serves many commuter areas including south western suburbs of London and the conurbations based on Southampton and Bournemouth. It runs through the counties of Surrey, Hampshire and Dorset. It forms the core of the network built by the London and South Western Railway, today mostly operated by South Western Railway.