Trans-Australian Railway

The Trans-Australian Railway is a massive rail link across the Australian continent.

It stretches from Port Augusta in South Australia to Kalgoorlie in Western Australia. This line crosses the vast and desolate Nullarbor Plain. It serves as the only rail freight corridor between Western Australia and the eastern states. Because of this role, the line is both economically and strategically vital. The railway is 1,693 miles long. It is famous for containing the world's longest section of completely straight track.

An astronaut, Andy Thomas, noted that the line looks like a fine pencil line drawn across the desert when seen from space.

The history of the railway is tied to the birth of the Australian nation. In 1901, the six Australian colonies federated to form the Commonwealth of Australia. At that time, Perth was isolated from the other states by thousands of kilometres of desert. The only practical way to travel was by sea. This required voyages across the rough Great Australian Bight. These trips were often time-consuming and uncomfortable. To encourage Western Australia to join the federation, leaders promised a federally funded railway. In 1907, legislation allowed for a route survey. The survey was finished in 1909 and suggested a path through Tarcoola. Construction officially began in Port Augusta in September 1912.

Building the track was a monumental feat of engineering. Work proceeded from both ends toward the middle. Crews moved eastwards from Kalgoorlie and westwards from Port Augusta. This work continued through the years of the First World War. At its peak, workers laid 11 miles of track in a single day. This remains an Australian tracklaying record. By 1915, the two ends of the line were only 110 miles apart. The two halves finally met at Ooldea on 17 October 1917. The total cost was estimated at £4,045,000. In modern terms, this is equivalent to roughly $800 million.

Operating the railway in a desert presented unique mechanical challenges. Early trains used steam locomotives, which require large amounts of water. However, the water found in desert bores had a high mineral salt content. This salt caused severe damage to the locomotive boilers. In fact, boiler repairs accounted for 87 per cent of all locomotive maintenance. Engineers eventually solved this by using barium carbonate water treatment plants.

To avoid these water issues, the original engineer, Henry Deane, suggested using diesel locomotives. Although the technology was not well-developed then, the railway eventually switched to diesel-electric locomotives in 1951.

The railway has also undergone significant changes in its track structure. For many years, the line used different track widths at each end. These were known as narrow-gauge lines. This meant passengers and freight had to change trains to continue their journey. In 1970, a major project completed the standardisation of the line. This turned the railway into a key part of the Sydney–Perth rail corridor. By 2004, the standard-gauge connection between all mainland state capitals was finally closed. This was achieved through connections between Port Pirie, Adelaide, and Melbourne.

This allowed for much more efficient travel across the country.

Today, the railway is used for both heavy freight and special tourism. Two major passenger services operate on the line. The Indian Pacific is an experiential tourism service that travels the entire length of the railway. The Ghan is another service that runs between Port Augusta and Tarcoola. From Tarcoola, The Ghan leaves the line to head north toward Darwin.

These trains allow travelers to experience the unique scenery of the Australian interior. The railway also remains a vital lifeline for moving goods across the continent.

Maintaining such a long line in a harsh environment requires modern technology. The railway uses crossing loops to allow trains to pass one another. These loops are at least 1,500 meters long and spaced about 30 miles apart. Many of these loops are unattended. Train crews use radio controls to set the track points as they approach. Some locomotives even use an activated points system (ICAPS) to set the route without stopping.

Despite these advances, the desert can still cause disruptions. Flooding and "washaways" can remove the ballast, which is the stone base under the tracks. These events can render parts of the railway inoperable, requiring significant repairs to restore the line.