British Rail Class 15

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BTH Type 1
British Rail Class 15
Sole surviving Class 15 no D8233 seen at Baron Street Loco Shed, East Lancashire Railway, February 2006
Type and origin
Power typeDiesel-electric
BuilderBritish Thomson-Houston at Clayton Equipment Company
Build date1957–1961
Total produced44
 • WhyteBo-Bo
 • UICBo'Bo'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 3+12 in (1.003 m)
Minimum curve3.5 chains (70 m)
Wheelbase31 ft 0 in (9.45 m)
Length42 ft 0 in (12.80 m)
Width9 ft 2 in (2.79 m)
Height12 ft 6 in (3.81 m)
Loco weight69 long tons (70.1 t)
Fuel capacity400 imp gal (1,800 l; 480 US gal)
Prime moverPaxman 16YHXL
GeneratorBTH RTB10858
Traction motorsBTH 137AZ, 4 off
TransmissionDC generator, DC traction motors
MU working Blue Star
Train brakesVacuum
Performance figures
Top speed60 mph (97 km/h)
Power outputEngine: 800 hp (597 kW)
At rail: 627 hp (468 kW)
Tractive effortMaximum: 37,500 lbf (166.8 kN)
Brakeforce31 long tons-force (310 kN)
Railroad(s)British Railways
Axle load classRA 4

The British Rail Class 15 diesel locomotives, also known as the BTH Type 1, were designed by British Thomson-Houston, and built by the Yorkshire Engine Company and the Clayton Equipment Company, between 1957 and 1961.