Australian Standard Garratt

With the outbreak of World War II, in 1939 the federal government formed the Commonwealth Land Transport Board (CLTB) to take responsibility for the country's land transport networks. In the national interest it was empowered to over-ride decisions of the state railways. In 1942, the CLTB appointed the Commissioner of Railways in Western Australia, Joseph Ellis, to investigate the capacity of Australia's narrow gauge network and recommend what locomotives should be purchased. Ellis recommended that three variations of Garratt locomotive be purchased; heavy, medium and light.^[1]

The CLTB elected to build only the light type to allow it to operate on any narrow gauge line in Australia. After an attempt to obtain drawings and licences from Beyer, Peacock and Company failed, in July 1942 the CLTB recommended to the War Cabinet that 30 locomotives be built locally. In August 1942, the War Cabinet approved the order, which was increased to 65 locomotives in November 1942. The Western Australian Government Railways' Chief Mechanical Engineer Frederick Mills was seconded to lead a team of engineers in Melbourne to design the new locomotive. The Queensland Railways were vocal opponents, stating its preference for a modified version of its C17 class.^[1]

The result was the Australian Standard Garratt locomotive. The first was built in a record-breaking four months, entering service in September 1943. Only 57 ASGs were completed; assembly of the remaining eight was cancelled at the end of the war. The locomotives were built by the WAGR's Midland Railway Workshops (10), the Victorian Railways' Newport Workshops (12), the South Australian Railways' Islington Railway Workshops (13), and Clyde Engineering, Sydney (22).^[2][3]

Because of differences between the states, especially in regard to loading gauges, the sharpness of curves, and axle load, especially in Queensland, the design had to be a compromise, which went against the idea of having a standardised design.^[1]

To enable the long-wheelbase engine units to negotiate sharp curves, the 1st and 3rd driving wheels^[i] were designed to be flangeless, but this proved to be a major flaw as it led to a tendency for the locomotives to derail on curves and points. Another key problem, which made the ASGs unpopular with locomotive crews, was that the firebox door opened flat on the floor of the driving cab, maximising heat radiation into the crew compartment.^[1] This resulted in them having fairly short lives with most withdrawn by the mid-1950s. Some were resold for use on the Emu Bay and Fyansford Cement Works Railways where they would have more successful careers.^[3][4]

The only surviving complete ASG is G33, which ran on the Fyansford Cement Works Railway until 1957. It was on static display at the Australian Railway Historical Society Museum in North Williamstown until 2013, when it was moved by road (together with a spare boiler) to the Bellarine Railway, Queenscliff, with the aim of full restoration.^{[13][14][15][needs update]}

Many front water tanks of ASGs have survived: one at Yatina, South Australia, two on a farm south of Peterborough, South Australia, one at the Workshops Rail Museum in Queensland, two at the Don River Railway in Tasmania, and several dotted around that state. They were used as water tanks for steam and fire-fighting until the early 1980s. Another also survives with the Launceston & North East Railway in Launceston, Tasmania. It was used as a waste oil tank by TasRail until the closure of the Hobart railway yard in 2014, possibly being the last steam engine component used by TasRail.^{[citation needed]}