The class operated on 1,067 mm (3 ft 6 in) narrow gauge lines in South Australia and the Northern Territory.

[1][2] The final locomotive was despatched to the North Australia Railway, returning south in September 1941.

[2] Eighteen were converted to burn oil during the 1949 coal strike, being converted back to coal burning after the strike ended.

All were withdrawn between 1954 and 1956 as the NSU diesel locomotives entered service.

[4] Media related to Commonwealth Railways NM class locomotives at Wikimedia Commons