MRWA F class

Midland Railway of Western Australia F class
F45 at Picton Yard in March 1986
Type and origin Power type Diesel-electric Builder English Electric, Rocklea Build date 1958 Total produced 7
Specifications Configuration: ​  • AAR A1A-A1A  • UIC (A1A)(A1A) Gauge 1,067 mm (3 ft 6 in) Loco weight 63.9 long tons (64.9 t; 71.6 short tons) Fuel type Diesel Prime mover English Electric 6SRKT Engine type Four-stroke diesel Aspiration Turbocharged Generator English Electric 827 Traction motors English Electric 525 Cylinders 6 Loco brake Air Train brakes Vacuum
Performance figures Power output 660 hp (490 kW) Tractive effort 36,800 lbf (164 kN) (continuous)
Career Operators Midland Railway of Western Australia Number in class 7 Numbers F40-F46 Delivered May 1958 Preserved F40, F41, F43, F44 Disposition 4 preserved, 3 scrapped

The F class were a class of diesel locomotives built by English Electric, Rocklea for the Midland Railway of Western Australia in 1958. They were later sold to the Western Australian Government Railways.

The F class was based upon the South Australian Railways 800 class. The seven members of the class entered service with the Midland Railway of Western Australia in 1958, and, together with the rest of the company's assets and operations, were taken over by the Western Australian Government Railways in 1964.

The first (F42) was withdrawn in November 1984.

Hotham Valley Railway have preserved F40 and F44 while Rail Heritage WA have F43. F41 is also on display at Moora.