2017 Trans-Australian Railway $1 PNC (Perth Mint)

The Trans-Australian Railway, opened in 1917, runs from Port Augusta in South Australia to Kalgoorlie in Western Australia, crossing the Nullarbor Plain in the process. As the only rail freight corridor between Western Australia and the eastern states, the line is strategically important. The railway includes the world's longest section of completely straight track.

The inaugural passenger train service was known as the Great Western Express; later, it became the Trans-Australian. As of 2020, two passenger services use the line, both of them experiential tourism services: the Indian Pacific for the entire length of the railway, and The Ghan between Port Augusta and Tarcoola, where it leaves the line to proceed north to Darwin.