Southern Shorthaul Railroad locomotive GM22, Lithgow, New South Wales, 29 December 2016.
GM12, GM22, GM27, GM37–8, GM40, GM42–7
One Rail Australia (GM37–8, GM40, GM42–7); Southern Shorthaul Railroad (GM12, GM22, GM27)
Year of entry into service:
1305 kW (GM12–21); 1342 kW (GM22–47)
The GM12 Class began service with Commonwealth Railways in 1955. They are similar to the earlier GM1 Class, but are more powerful and have a Co-Co wheel arrangement, whereas the GM1 Class has A1A-A1A wheel arrangement. Their lengthy service continues with private operators, mainly in New South Wales and South Australia.