Commonwealth Railways GM12 class locomotive, built by Clyde Engineering, Granville.
- Power unit EMD16-567C, V16
- Generator EMD D12
- Power output 1800hp
- Tractive effort (continuous) 57,300lb
- Max speed 89mph (143kph)
- Weight 116t
Modifications were made to the roof on GM37-GM47.
Traction motors varied across the models with:
- D37 used for GM12-GM21
- D47 used for GM22-GM26
- D57 used for GM27-GM29
- D67 used for GM30-GM39
- D77 used for GM40-GM47
GM17-GM21 had a window added to the right hand side read, the same as the NSWGR 42 class, but without a side window.
There were 36 in the class, of which this model represents GM12-GM36.