British Rail Class 12

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British Rail Class 12
Builder: BR Ashford Works
Years built: 19491952
Early numbers: 15211–15236
Engine: English Electric 6KT
Transmission: Diesel Electric
Wheel layout: 0-6-0
Wheel diameter: 54 in (1.372 m)
Wheelbase: 11 ft 6 in (3.5 m)
Length: 29 ft 5.5 in (9.0 m)
Width: 9 ft 0 in (2.7 m)
Height: 12 ft 8.5 in (3.9 m)
Weight: 48 long tons (48.8 t)
Maximum speed: 27.5 mph (44 km/h)
Engine power: 350 bhp (261 kW)
Maximum TE: 24,600 lbf (109 kN)
Fuel capacity: 660 imp gal (3,000 l)
Route availability: 5

The British Rail Class 12 is a diesel locomotive built primarily for shunting duties.

This was the second batch of standard Southern Railway shunters based on the English Electric 6KT 350 hp (260 kW) diesel engine. The first batch (BR numbers 15201-15203) were built by the SR in 1937 and were later classified D3/12.

The locomotives described in this article were built at the BR Ashford Works over the period 1949-1952. They were numbered 15211-15236 and became Class 12. No locomotives survived long enough to acquire Class 12 TOPS numbers.

[edit] Technical details

The diesel engine is an English Electric 6-cylinder, 4-stroke, 6KT and the traction motors are 2 x EE506 axle-hung, nose-suspended, force-ventilated traction motors with 17.5:1 double reduction gear drive. The main generator is an EE type EE801/7D, flange-mounted single bearing rated at 490 kW.

[edit] Preservation

The only surviving locomotive of the class is 15224, located at the Spa Valley Railway, Royal Tunbridge Wells.