Tasmanian Government Railways M class
Type and origin Power type Steam Builder Beyer, Peacock & Co Serial number 5523, 5524 Build date 1912 Total produced 2
Specifications Configuration: ​  • Whyte 4-4-2+2-4-4 Gauge 1,067 mm (3 ft 6 in) Driver dia. 5 ft 0 in (1,524 mm) Total weight 95 long tons 0 cwt (212,800 lb or 96.5 t) Fuel type Coal Boiler pressure 160 lbf/in2 (1.10 MPa) Cylinder size 12 in × 20 in (305 mm × 508 mm)
Performance figures Tractive effort 24,576 lbf (109.32 kN)
Career Operators Tasmanian Government Railways Numbers M1-M2 Disposition Both scrapped

The Tasmanian Government Railways M class was a class of 4-4-2+2-4-4 Garratt steam locomotives operated by the Tasmanian Government Railways.

In 1912, the Tasmanian Government Railways took delivery of two 4-4-2+2-4-4 Garratt locomotives from Beyer, Peacock & Co, Manchester. They were designed to haul express passenger trains between Launceston and Hobart. With the introduction of the R class, M1 was withdrawn in 1923 and sold to the Mount Lyell Mining and Railway Company while M2 was withdrawn in 1931 and scrapped in 1953.^[1][2][3]

The M class designation was reused by the M class that was introduced in 1952.