The Commonwealth Railways were estabished in 1912, as part of a government department, currently called the Department of Transport and Regional Services, by the Government of Australia to construct the Trans-Australian Railway and the proposed Port Augusta to Darwin railway. It was absorbed into the Australian National Railways Commission in 1975. // Australia is a constitutional monarchy, a federation and a parliamentary democracy. ... Looking east on the Trans-Australia Railway from Cook, South Australia The Trans-Australian Railway crosses the Nullarbor Plain from Port Augusta in South Australia to Kalgoorlie in Western Australia and contains the longest straight stretch of track in the world. ... The Australian National Railways Commission (ANRC) was established by the Whitlam Government in 1975, incorporating the former Commonwealth Railways, the former Tasmanian Government Railways and the non-urban railways of South Australia. ...