British Rail Class 12

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British Rail Class 12
Type and origin
Power typeDiesel-electric
BuilderBritish RailwaysAshford Works
Order numberSR 3413 (15), 3537 (11)
Build date1949–1952
Total produced26
 • Whyte0-6-0
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter4 ft 6 in (1.372 m)
Wheelbase11 ft 6 in (3.51 m)
Length29 ft 5+12 in (8.98 m)
Width9 ft 0 in (2.74 m)
Height12 ft 8+12 in (3.87 m)
Loco weight48 long tons (48.8 t)
Fuel capacity660 imp gal (3,000 l; 790 US gal)
Prime moverEnglish Electric 6KT
Traction motorsEnglish Electric 506A, 2 off
TransmissionDC generator, DC traction motors, double reduction gearing
MU workingNot fitted
Train heatingNone
Train brakesNone; 15230–15232 Air from 1970
Performance figures
Top speed27.5 mph (44.3 km/h)
Power outputEngine: 350 hp (261 kW)
Tractive effortMaximum: 24,600 lbf (109.4 kN)
Railroad(s)British Railways
Axle load classRA 5

The British Rail Class 12 is a diesel locomotive built mainly 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. These locomotives (BR numbers 15201-15203) were built by the SR in 1937 and were later classified D3/12.

The Class 12 locomotives 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 though.