The first six (single-ended) locomotives were delivered in 1955 and 1956 to operate over the steeply gradedAdelaide to Tailem Bend line and onwards to Serviceton. A further 31 (double-ended) entered service between July 1957 and June 1967 and operated across the broad-gauge network. The double-ended locomotives had a "bulldog" nose at the "A" end (not as round as the Clyde–GM "Bulldog nose" type) and were flat at the "B" end . All were delivered with broad-gauge bogies and worked across the South Australian Railways network.[2] In hot weather, crews frequently marshalled the locomotives with the "B" end leading so that the front door could be opened to provide more air circulation.[3]
In March 1978, all were included in the transfer of the South Australian Railways to Australian National. From 1982, some were converted to standard gauge using bogies from State Rail Authority44 class locomotives hauling trains from Adelaide to Whyalla and Broken Hill.[4] On the broad gauge, some began operating through to Melbourne in the mid-1980s.[5]
In 1986, a new computer system required the class leaders of the former South Australian Railways to be renumbered as the last member of the class, with 930 becoming 967.[6]