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Specifications
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

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

Midland Railway of Western Australia G class
Midland Railway of Western Australia G class
	G51 at Northcliffe in July 1986
Power type
Type and origin
Power type	Diesel-electric
Builder	English Electric, Rocklea
Build date	1963
Total produced	2
Configuration:;
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
Maximum speed
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)
Operators
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.

History

The G class was a class of diesel-electric locomotives based upon the British Rail Class 20, with a cab similar to the Jamaican Railways Class 81 and its Australian derivatives. The two members of the class entered service with the Midland Railway of Western Australia in May 1963 after being shipped from Rocklea. They entered service on the Midland to Watheroo line.^[1]^[2]

Together with the rest of the company's assets and operations, they were taken over by the Western Australian Government Railways in 1964. In their later years they operated out of Bunbury and Perth.^[2]