The Southern Highlands Line (SHL) is an intercity rail service operated by NSW TrainLink that services the Macarthur, Southern Highlands and Southern Tablelands regions of New South Wales. First operating in 1869, the service runs from Campbelltown across the Main Southern railway line through to Goulburn, with peak hour services extending the route to Central. The railway service operates alongside a bus route from Picton to Bowral, operating on the route of the Picton – Mittagong loop railway line, and a regional coach service from Bundanoon to Wollongong on the South Coast Line, operating on the corridor of the Unanderra–Moss Vale railway line.

The Main Southern Railway is a major railway in New South Wales, Australia. It runs from Sydney to Albury, near the Victorian border. The line passes through the Southern Highlands, Southern Tablelands, South West Slopes and Riverina regions.