The T4 Eastern Suburbs & Illawarra Line is a commuter rail service in Sydney, Australia. It connects the eastern suburbs of Sydney, including Bondi Junction and Kings Cross, to the Illawarra region, extending to Waterfall and Cronulla. The line is part of the Sydney Trains network and provides essential transport for residents and visitors. This line features several key stations, such as Central Station, which serves as a major interchange. The T4 line operates frequent services, making it convenient for commuters. It plays a vital role in connecting urban areas with scenic coastal destinations along the Illawarra coastline.