The WAGR M class was a class of diesel-electric locomotives operated by the Western Australian Government Railways (WAGR) from 1966 to 2000. These locomotives were built by Clyde Engineering under license from Electro-Motive Diesel (EMD) and were based on the EMD G26C model. They were primarily used for hauling both freight and passenger trains across the state's extensive railway network.
The M class locomotives were characterized by their Co-Co wheel arrangement (two three-axle bogies), providing good adhesion and weight distribution. They were powered by an EMD 16-645E V16 diesel engine, generating approximately 2,200 horsepower. This engine drove an electrical generator, which in turn powered the traction motors located on each axle.
Throughout their service life, the M class locomotives underwent several modifications and upgrades. They proved to be reliable and versatile locomotives, playing a significant role in the operation of the WAGR. Following the privatization of the WAGR in 2000, most of the M class locomotives were sold to other railway operators, while some were preserved for heritage purposes. Their legacy remains an important part of Western Australia's railway history.