Queensland Railways 1250 class

Cutaway 1262 at the Workshops Rail Museum, North Ipswich in October 2011

| Type and origin

Power type| Diesel-electric
Builder| English Electric, Rocklea
Build date| 1959–1963
Total produced| 17
| 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
| 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)
| 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.

## History[edit]

1251 in Gympie yard hauling a northbound freight train including a new 3100 class locomotive being delivered to Gladstone in 1987

The design of the 1250 class was unusual being a cab unit with a cab similar to the 1200 class but with a narrow long hood.[1] They were based on a design built for use in Brazil five years prior.

The first five units had a 1,035 kW (1,390 hp) engine and screw couplers.

The subsequent units fitted with a 1,145 kW (1,540 hp) engine, auto couplers and were wired for multiple unit operation.

They were used on ore traffic on the Great Northern line, and on general freight on the North Coast and Southern lines.[1][2][3] A characteristic addition to the 1250 class in 1961 was a sun visor to help reduce glare.

## Withdrawal & disposal[edit]

Two were withdrawn in the early 1980s, donating parts to the rebuild of the single 1225 class locomotive. The remainder were withdrawn in 1987. Two units have been preserved:[1][4]

* 1262 was retained by the Queensland Rail Heritage Division and is on static display as a cutaway at the Workshops Rail Museum, North Ipswich
* 1263 is owned by the Australian Railway Historical Society and stored in Townsville

## Status table[edit]

Number | Serial
number | In service | Withdrawn | Scrapped | Notes

|
|
|
|
|

1250  | A.025  | 22 July 1959 | 20 March 1987 | December 1989 |
1251  | A.026  | 27 August 1959 | 16 November 1987 | December 1989 |
1252  | A.027  | 21 September 1959 | 12 October 1980 | September 1985 |
1253  | A.028  | 4 November 1959 | 24 September 1987 | December 1989 |
1254  | A.029  | 30 December 1959 | 3 November 1987 | December 1989 |
1255  | A.043  | 4 September 1960 | 6 November 1987 | December 1990 |
1256  | A.044  | 4 November 1960 | 6 November 1987 | December 1990 |
1257  | A.045  | 24 November 1960 | 24 November 1987 | December 1990 |
1258  | A.046  | 15 December 1960 | 5 November 1987 | December 1990 |
1259  | A.047  | 27 January 1961 | 11 September 1987 | December 1989 |
1260  | A.048  | 26 September 1961 | 16 November 1987 | December 1990 |
1261  | A.049  | 26 September 1961 | 16 November 1987 | December 1990 |
1262  | A.050  | 27 October 1961 | 3 November 1987 |  | Preserved, Queensland Rail Heritage Division, Workshops Rail Museum
1263  | A.051  | 22 November 1961 | 16 November 1987 |  | Preserved, Australian Railway Historical Society
1264  | A.052  | 18 April 1962 | 20 November 1987 | December 1990 |
1265  | A.074  | 25 July 1963 | 21 September 1987 | December 1989 |
1266  | A.075  | 31 July 1963 | 7 October 1987 | December 1989 |

## References[edit]

1. ^ a b c Electric 1250 Class Queensland's Railway Interest Group
2. ^ Oberg, Leon (2007). Locomotives of Australia: 1850s-2007. Rosenberg Publishing. pp. 306–307. ISBN 978-1877058547.
3. ^ 1250 & 1270 Class Queensland's Great Trains
4. ^ Diesel Locomotives Association of Tourist Railways Queensland 13 March 2011

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