Queensland Railways 1250 class

Queensland Railways 1250 class
Cutaway 1262 at the Workshops Rail Museum, North Ipswich in October 2011
Type and origin
Power typeDiesel-electric
BuilderEnglish Electric, Rocklea
Build date1959–1963
Total produced17
Specifications
Configuration:
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 • CommonwealthCo-Co
Gauge1,067 mm (3 ft 6 in)
Wheel diameter3 ft 1+1⁄2 in (0.953 m)
Wheelbase40 ft 6 in (12.344 m) total, 12 ft 6 in (3.810 m) bogie
Length49 ft 6 in (15.088 m) over headstocks
Width9 ft 2 in (2.794 m)
Axle load15 long tons (15.2 t; 16.8 short tons)
Loco weight90 long tons (91.4 t; 100.8 short tons)
Fuel typeDiesel
Fuel capacity750 imp gal (3,400 L)
Prime moverEnglish Electric 12SVT mark 2
RPM range400–850 rpm
Engine typefour stroke, four valves per cylinder
Aspirationturbocharged
GeneratorEnglish Electric English Electric 822
Traction motorsEnglish Electric English Electric 525
Cylinders12 vee
Cylinder size10 in × 12 in (254 mm × 305 mm)
Transmissionelectric
MU working110V, stepless electro-pneumatic throttle (1255-1266 only fitted)
Loco brakeair
Train brakesair
Performance figures
Maximum speed50 miles per hour (80 km/h)
Power output1,395 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 effort40,200 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)
Career
OperatorsQueensland Railways
Number in class17
Numbers1250-1266
First run23 July 1959
Last run24 November 1987
Preserved1262, 1263
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.