The GT46C is a model of diesel-electric locomotive designed and built by Clyde Engineering using Electro-Motive Diesel components.

[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.

[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.

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.