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Midland Railway of Western Australia G class

G51 at Northcliffe in July 1986

Type and origin
Power type	Diesel-electric
Builder	English Electric, Rocklea
Build date	1963
Total produced	2

Specifications
Configuration:
• AAR	C-C
• UIC	Co-Co
Gauge	1,067 mm (3 ft 6 in)
Wheel diameter	3 ft 1+1⁄2 in (0.953 m)
Minimum curve	250 ft (76.200 m)
Wheelbase	32 ft (9.754 m) total, 11 ft 6 in (3.505 m) bogie
Length	41 ft (12.497 m) over headstocks
Width	8 ft 11 in (2.718 m)
Height	12 ft 7 in (3.835 m)
Axle load	12+1⁄2 long tons (12.7 t; 14.0 short tons)
Loco weight	75 long tons (76.2 t; 84.0 short tons)
Fuel type	Diesel
Fuel capacity	700 imp gal (840 US gal; 3,200 L)
Prime mover	English Electric 8SVT Mk II
RPM range	450–850 rpm
Engine type	Four-stroke, four valves per cylinder
Aspiration	turbocharged
Generator	EE819/7E
Traction motors	Six EE548A
Cylinders	8 Vee
Cylinder size	10 in × 12 in (254 mm × 305 mm)
MU working	110V, stepless electro-pneumatic throttle
Loco brake	straight air
Train brakes	vacuum

Performance figures
Maximum speed	55 miles per hour (89 km/h)
Power output	1,030 hp (770 kW) gross, 950 hp (710 kW) net
Tractive effort	43,000 lbf (191.3 kN) at 5.9 mph (10 km/h)

Career
Operators	Midland Railway of Western Australia
Number in class	2
Numbers	G50-G51
First run	7 May 1963
Preserved	G50
Disposition	1 preserved, 1 scrapped

The G class were a class of diesel locomotives built by English Electric, Rocklea for the Midland Railway of Western Australia in 1963. They were later sold to the Western Australian Government Railways.