Singleton is a town on the banks of the Hunter River in New South Wales, Australia. Singleton is 202km (89 mi) north-north-west of Sydney, and 70 km (43 mi) north-west of Newcastle. At June 2018, Singleton had an urban population of 16,346.

The Main North Line is a major railway in New South Wales, Australia. It runs through Strathfield to Armidale. The line is the main line between Sydney and Armidale. As of 1988, the line closed progressively north of Armidale with services gradually withdrawn till 2004, with the main route between Sydney and Brisbane now the North Coast line.