WAGR M class

The first batch of six engines was constructed in 1911. These engines, entered into service with WAGR in 1912, were only the third Garratt design to be produced and represented a significant step in the development of the type. The second batch, which consisted of seven units, was built in 1913/14 and designated as the Ms class due to the use of superheated steam. One of the engines from the first batch was retrofitted with a superheater and given a Ms classification.^[2][3]

All of the M/Ms class locomotives were utilized to haul trains on the WAGR's light lines. They were withdrawn from service between 1947 and 1955, and all were scrapped.^[1]

The M class designation was previously used for the M class locomotives that were withdrawn in 1911. It was reused in the 1970s when the M class diesel locomotives entered service.

• History of rail transport in Western Australia
• List of Western Australian locomotive classes