Downer EDI Rail GT46C

In May 1996, Westrail ordered 15 GT46Cs from Clyde Engineering as part of an order that also included nine narrow gauge S class locomotives.[1] The order was later extended to 19.[2] All were assembled at a facility established by Clyde Engineering within Westrail's Forrestfield Depot to fulfill the contract with components manufactured at Clyde's Kelso and Somerton plants.[3][4] All were included in the sale of Westrail to Australian Railroad Group in December 2000 and again to QR National in June 2006. Initially numbered as the Q class, they were later reclassified as the 4000 class.[5][6]

Following the destruction of two G class locomotives in 1999, Freight Australia ordered a single GT46AC from EDI Rail who had purchased Clyde Engineering. It was built at their Cardiff Locomotive Workshops in 2002.[7][8] Numbered V544, it was named after Deputy Prime Minister Tim Fischer. It was included in the sale of the business to Pacific National in February 2004. The locomotive initially operated interstate freight duties, primarily the SCT Logistics service from Melbourne to Perth. In late 2007, it moved to haul Leigh Creek to Port Augusta coal trains in South Australia, servicing the Playford B and Northern power stations. Between March 2014 and May 2021, V544 was stored at Port Augusta workshops after a major engine failure. In May 2021, it was sold to One Rail Australia and has since been painted into their livery. It was included in the sale of the majority of ORA's assets to Aurizon.

In 2003, four were built by EDI Rail at Port Augusta for FreightLink. They were purchased for use on the Adelaide-Darwin railway. The first two units were painted in Indigenous Australian liveries, the other two were in FreightLink red.[9][10] All were included in the sale of FreightLink to One Rail Australia,[11][12] and later the sale of ORA to Aurizon.

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  Australian Railroad Group Q4015 in July 2008
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  Australian Railroad Group Q4004 in March 2009
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  Pacific National V544 at Mambray Creek, South Australia in August 2007
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  FreightLink indigenous liveried FQ01 in Darwin in January 2004
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  Freight Australia SCT train V544/G538/G539 in the Swan Valley, Western Australia.
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  English: Q 4001 Aurizon Bulk Freight West train in Fremantle.
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  Aurizon ex-Westrail Q class locomotive no Q4019, in ARG livery, runs through Kalgoorlie railway station West Kalgoorlie yard and the Cockburn Cement depot in Parkeston, Western Australia.
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  Aurizon ex-Westrail Q class locomotive no Q4019, in ARG livery, runs through Kalgoorlie railway station West Kalgoorlie yard and the Cockburn Cement depot in Parkeston, Western Australia.
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  The Ghan – first journey completed.