The South Coast Line (SCO) is an intercity rail service operated by NSW TrainLink that services the Illawarra region of New South Wales, Australia. The service runs from Central, and runs the entire length of the eponymous South Coast railway line to Bomaderry. The service also runs along the Eastern Suburbs railway line at peak hours and the Port Kembla railway line to Port Kembla. It is operated with NSW TrainLink H sets and Sydney Trains T sets, with Endeavour railcars operating the service on the non-electrified line between Kiama and Bomaderry.

The Eastern Suburbs Railway (ESR) is a commuter railway line in Sydney constructed in the 1970s. It is operated by Sydney Trains and has stations at Martin Place, Kings Cross, Edgecliff and Bondi Junction. In addition, it has dedicated platforms at Town Hall, Central and Redfern stations. All of these stations are underground. The Eastern Suburbs railway connects with the Illawarra line at Erskineville, forming the Eastern Suburbs & Illawarra Line. The line features turnbacks at Central, Martin Place and Bondi Junction. There was also previously a rarely used cross-over at Edgecliff. It operates a service every 3 to 5 minutes during weekday peak hours and 8 to 10 minutes at all other times.