The C Class are a class of diesel locomotive built by Clyde Engineering, Rosewater for the Victorian Railways in 1977–1978. History The C class were purchased by the Victorian Railways for heavy freight haulage. They are a variant of the WAGR L class (itself an Australianised EMD SD40) fitted with safety cabs. Initially, the first four were placed on the North East line to haul services from Melbourne to Albury while the latter six were put on the broad gauge to haul services on the Serviceton line. Following upgrades to the infrastructure, they were also able to operate on the Ballarat to Geelong line and from January 1982 through to Adelaide with the standard gauge units transferred to the broad gauge. On 3 August 1979, engines C505 and 506 ran through to Adelaide for the first time as part of a trial of through-running, in place of the previous practice involving changing locomotives at the border. C505 led on the westbound trip with a trailing load of 1,755 tonnes and 506 led on the eastbound with 1,804 tonnes. A number of stop-and-start tests were undertaken on the Adelaide hills line to test the engines' ability to handle heavy loads, and running times were tested particularly between Tailem Bend and Mile End. New radio communication systems were also trialled between the driver and guard using fixed units in lieu of the earlier portable units. The trial was deemed a success, with through-running becoming a regular feature from 12 November. At the time a number of C Class engines were running on the standard gauge between Melbourne and Albury, and it was intended to recall these for broad gauge interstate work and have them replaced by locomotives from Australian National Railways. In September 1988, two were transferred back to the standard gauge and began to operate services through to Sydney. Following the Melbourne-Adelaide railway being closed for gauge conversion, all remaining broad gauge units were converted to standard gauge and operated services from Melbourne to Parkes until the converted line reopened in July 1995. All were transferred by V/Line to National Rail in June 1995. Following the delivery of National Rail's NR class locomotives, the C class were put into storage at Junee Locomotive Depot in 1997 before being moved to Islington Railway Workshops, Adelaide. Unlike the other locomotives National Rail initially used, ownership of the C class passed to National Rail.