British Rail Class 42

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British Rail Class 42 “Warship”
Class 42 D832.jpg
British Rail Class 42 No. D832
Type and origin
Power typeDiesel-hydraulic
BuilderBritish RailwaysSwindon Works
Build date1958–1961
Total produced38
 • WhyteB-B
 • UICB'B'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 3+12 in (1.003 m)
Minimum curve4.5 chains (91 m)
Wheelbase48 ft 3 in (14.71 m)
Length60 ft 0 in (18.29 m)
Width8 ft 10 in (2.69 m)
Height12 ft 0+12 in (3.670 m)
Loco weight78 long tons (79.3 t)
Fuel capacity800 imp gal (3,600 l; 960 US gal)
Prime moverMaybach MD650, 2 off
MU working White Diamond
Train heatingSteam generator
Train brakesVacuum
Performance figures
Top speed90 mph (145 km/h)
Power outputEngines: 1,000 hp (746 kW) × 2
Tractive effortMaximum: 48,200 lbf (214 kN)
Railroad(s)British Railways
NumberD800–D832, D866–D870
Axle load classRoute availability 7 (RA 6 from 1969)

British Railways' (BR) Type 4 "Warship" class diesel-hydraulic locomotives were introduced in 1958. It was apparent at that time that the largest centre of expertise on diesel-hydraulic locomotives was in Germany. The Western Region of British Railways (in view of post-World War II sensibilities) negotiated a licence with German manufacturers to scale down the German Federal Railway's "V200" design to suit the smaller loading gauge of the British network, and to allow British manufacturers to construct the new design. The resultant design bears a close resemblance both cosmetically and in the engineering employed. They were divided into two batches: examples built at BR's Swindon works were numbered in the series D800 to D832 and from D866 to D870, had a maximum tractive effort of 52,400 pounds force and are the British Rail Class 42 of this article. 33 others, D833-865, were constructed by the North British Locomotive Company and became British Rail Class 43. They were allocated to Bristol Bath Road, Plymouth Laira, Newton Abbot and Old Oak Common.