Tasmanian Government Railways M class (1952)

The Tasmanian Government Railways (TGR) M class locomotive was a class of diesel-electric locomotive introduced in 1952. These locomotives represented a significant step in the modernization of the TGR, replacing older steam locomotives on various freight and passenger services.

The M class locomotives were built by the English Electric Company and were designed for the 3 ft 6 in (1,067 mm) gauge railway. They were equipped with English Electric diesel engines and electrical transmission systems. Their introduction allowed for increased efficiency and reduced operating costs compared to steam power.

The primary role of the M class was hauling freight trains across the Tasmanian railway network. They were also utilized on passenger services, particularly on longer routes. Their reliability and power made them a mainstay of the TGR fleet for many years.

Over their service life, the M class locomotives underwent various maintenance and refurbishment programs to extend their operational lifespan. However, as newer locomotives were introduced, the M class were gradually withdrawn from service, with most being retired by the late 20th century. A number have been preserved.

The M class is considered a notable class of locomotive in Tasmanian railway history, marking a key period of transition from steam to diesel power and playing an important role in the state's transportation infrastructure.