from Wikipedia:
The design was based on the Electro-Motive Diesel EMD F7 locomotive. The first 11 were delivered with EMD 16-567B, 1,119 kW (1,501 hp) engines and four powered axles with the remainder having 16-567C, 1,305 kW (1,750 hp) engines and six powered axles. The final 11 were fitted with dynamic braking.
Delivered to operate on the standard gauge Trans-Australian Railway, the first entered service in September 1951. Further orders saw 47 in service by December 1967. They operated on all of Commonwealth Railways's standard gauge lines including those to Broken Hill, Alice Springs, Marree and Adelaide when converted to standard gauge in 1970, 1980 and 1982 respectively.
In January 1972, three (31, 32 & 34) were loaned to the Victorian Railways for use on the North East line. The latter two were returned in May 1976, the former in November 1976.
In July 1975, all were included in the transfer of Commonwealth Railways to Australian National. In 1979, a few operated to Lithgow, New South Wales on trials, while in October 1983, three (23, 24 & 28) were hired to V/Line returning in October 1985.
The GM class were manufactured for standard gauge use, some of the locomotives were converted to operate on 5 ft 3 in (1,600 mm) broad gauge for some of their lives.
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