Queensland Railways 1250 class

Specifications
Specifications
Configuration:;
• Commonwealth	Co-Co
Gauge	1,067 mm (3 ft 6 in)
Wheel diameter	3 ft 1+1⁄2 in (0.953 m)
Wheelbase	40 ft 6 in (12.344 m) total, 12 ft 6 in (3.810 m) bogie
Length	49 ft 6 in (15.088 m) over headstocks
Width	9 ft 2 in (2.794 m)
Axle load	15 long tons (15.2 t; 16.8 short tons)
Loco weight	90 long tons (91.4 t; 100.8 short tons)
Fuel type	Diesel
Fuel capacity	750 imp gal (3,400 L)
Prime mover	English Electric 12SVT mark 2
RPM range	400–850 rpm
Engine type	four stroke, four valves per cylinder
Aspiration	turbocharged
Generator	English Electric English Electric 822
Traction motors	English Electric English Electric 525
Cylinders	12 vee
Cylinder size	10 in × 12 in (254 mm × 305 mm)
Transmission	electric
MU working	110V, stepless electro-pneumatic throttle (1255-1266 only fitted)
Loco brake	air
Train brakes	air

Type and origin
Type and origin
Power type	Diesel-electric
Builder	English Electric, Rocklea
Build date	1959–1963
Total produced	17

Queensland Railways 1250 class
Queensland Railways 1250 class
	Cutaway 1262 at the Workshops Rail Museum, North Ipswich in October 2011
Power type
Type and origin
Power type	Diesel-electric
Builder	English Electric, Rocklea
Build date	1959–1963
Total produced	17
Configuration:;
Specifications
Configuration:;
• Commonwealth	Co-Co
Gauge	1,067 mm (3 ft 6 in)
Wheel diameter	3 ft 1+1⁄2 in (0.953 m)
Wheelbase	40 ft 6 in (12.344 m) total, 12 ft 6 in (3.810 m) bogie
Length	49 ft 6 in (15.088 m) over headstocks
Width	9 ft 2 in (2.794 m)
Axle load	15 long tons (15.2 t; 16.8 short tons)
Loco weight	90 long tons (91.4 t; 100.8 short tons)
Fuel type	Diesel
Fuel capacity	750 imp gal (3,400 L)
Prime mover	English Electric 12SVT mark 2
RPM range	400–850 rpm
Engine type	four stroke, four valves per cylinder
Aspiration	turbocharged
Generator	English Electric English Electric 822
Traction motors	English Electric English Electric 525
Cylinders	12 vee
Cylinder size	10 in × 12 in (254 mm × 305 mm)
Transmission	electric
MU working	110V, stepless electro-pneumatic throttle (1255-1266 only fitted)
Loco brake	air
Train brakes	air
Maximum speed
Performance figures
Maximum speed	50 miles per hour (80 km/h)
Power output	1,395 hp (1,040 kW) gross, 1,240 hp (920 kW) net (1250-1254); 1,540 hp (1,150 kW) gross, 1,390 hp (1,040 kW) net (1255-1266)
Tractive effort	40,200 lbf (178.8 kN) at 9.4 mph (20 km/h)(1250-1254); 46,500 lbf (206.8 kN) at 9.4 mph (20 km/h) (1255-1266)
Operators
Career
Operators	Queensland Railways
Number in class	17
Numbers	1250-1266
First run	23 July 1959
Last run	24 November 1987
Preserved	1262, 1263
Disposition	2 preserved, 15 scrapped

The 1250 class were a class of diesel locomotive built by English Electric, Rocklea for Queensland Railways between 1959 and 1963.

Queensland Railways 1250 class

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