WAGR M class (diesel)

Western Australian Government Railways M class
MA1862 & M1851 at Forrestfield in March 1986
Type and origin Power type Diesel-hydraulic Builder Walkers Limited, Maryborough Model GH500V Build date 1972-1973 Total produced MA: 2 MA: 3
Specifications Configuration: ​  • AAR B-B  • UIC B'B' Gauge 1,067 mm (3 ft 6 in) Loco weight M: 53.8 tonnes (53.0 long tons; 59.3 short tons) MA: 44.7 tonnes (44.0 long tons; 49.3 short tons) Fuel type Diesel Prime mover M: Cummins VTA 1710L MA: Caterpillar D379B Transmission Voith L4R4U2 MU working M: none MA: within class.
Performance figures Maximum speed 45 mph (72 km/h) Power output M: 450 kW (600 hp) MA: 520 kW (700 hp) Tractive effort 109 kN (25,000 lbf)
Career Operators Western Australian Government Railways Number in class M: 2 MA: 3 Numbers M1851–M1852 MA1861–MA1863 First run 1972

The M class are a class of diesel-hydraulic locomotives built by Walkers Limited, Maryborough for the Western Australian Government Railways in 1972-1973.

Walkers Limited had previously supplied similar locomotives to the Emu Bay Railway (as the 11 class), Queensland Railways (as the DH class) and the New South Wales Government Railways (as the 73 class).

The first two members were purchased for use in hump shunting at Forrestfield yard. In 1973 a further three were purchased. These differed in having Caterpillar engines, were much lighter and could operate in multiple with each other. These were designated as the MA class. In January 1994, four were written off and later sold to CSR for use on its sugar cane railways in Queensland. MA1862 remained in service with Transperth as the Claisebrook depot shunter until 2014. In 2015, it was sold to the Hotham Valley Railway.

In 1996, M1851 was sold and returned to Walkers for conversion to a 610 mm (2 ft) locomotive for further use hauling sugar trains in Queensland. It remained in service in 2014.