On 12 March 1952, the Tasmanian Government Railways (TGR) took delivery of ten M class branch line locomotives from Robert Stephenson & Hawthorns, Newcastle-upon-Tyne.

[1][2] The locomotives were similar to the Indian Railways YB class.

Hence in 1957, four were fitted with smaller driving wheels recovered from withdrawn Australian Standard Garratts enabling them to operate heavier trains over the steeply graded North-Eastern line.

[4] All members of the class have been preserved to an extent, with four locomotives seeing further use on heritage trains.

Media related to TGR M class locomotives at Wikimedia Commons