The South Line, also known as the Main Line and sometimes the North/South Line or the North–South Line, is a rail corridor connecting Hobart to the northern ports of Tasmania. The Railway Line was built by the Tasmanian Main Line Company.

Hobart is the capital and most populous city of the island state of Tasmania, Australia. Home to almost half of all Tasmanians, it is the southernmost and least-populated Australian state capital city, and second-smallest if territories are taken into account, before Darwin. Hobart is located in Tasmania's south-east on the estuary of the River Derwent, making it the most southern of Australia's capital cities. Its skyline is dominated by the 1,271-metre (4,170 ft) kunanyi / Mount Wellington, and its harbour forms the second-deepest natural port in the world, with much of the city's waterfront consisting of reclaimed land. The metropolitan area is often referred to as Greater Hobart, to differentiate it from the City of Hobart, one of the seven local government areas that cover the city. It has a mild maritime climate.