The 2700 Class is an upgraded rebuild of several versions of the current fleet of Aurizon mainline locomotives. The main changes being replacing the 12 cylinder 645 GM engine with an 8 cylinder 710 Turbo GM engine of 2200 HP.
Other changes include a larger capacity main alternator, D31 traction motors, increased dynamic braking capacity, cooling fans, compressor, and a new toilet located forward of the radiator compartment, along with numerous other improvements to the locomotive and controls.
Currently there are 6 of this class and they are seeing regular service on the coal trains between the coal mines on the Darling Downs and the Port of Brisbane.
Initial testing and proving the design took quite a while to complete, with a major load test being conducted on the steepest section of the line at Yarongmulu, near Laidley Qld involving a complete loaded coal train, including (non assisting) locomotives, being brought to a halt, and then doing a standing start, with 4 of the 12 traction motors cut out. Since then minor issues have been rectified and the locos are proving themselves worthy of the task.