Mount Colah railway station is located on the Main Northern line, serving the Mount Colah suburb of Sydney, Australia. It is served by Sydney Trains T1 North Shore Line services and some early morning and late night NSW TrainLink Central Coast & Newcastle Line services.

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 As of 1988, the line closed progressively north of Armidale with services gradually withdrawn till 2004, with the main route between Sydney and Brisbane now the North Coast line.