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British Rail Class 42 “Warship”
British Rail Class 42 No. D832
Power type Diesel-hydraulic
Builder British Railways’ Swindon Works
Build date 1958–1961
Total production 38
Configuration B-B
UIC classification B'B'
Gauge 4 ft 8 12 in (1,435 mm)
Wheel diameter 3 ft 3+12 in (1.003 m)
Minimum curve 4.5 chains (91 m)
Wheelbase 48 ft 3 in (14.71 m)
Length 60 ft 0 in (18.29 m)
Width 8 ft 10 in (2.69 m)
Height 12 ft 0+12 in (3.670 m)
Locomotive weight 78 long tons (79.3 t)
Fuel capacity 800 imp gal (3,600 L; 960 US gal)
Prime mover Maybach MD650, 2 off
Transmission Hydraulic
Multiple working White Diamond
Top speed 90 mph (145 km/h)
Power output Engines: 1,000 hp (746 kW) × 2
Tractive effort Maximum: 48,200 lbf (214 kN)
Train heating Steam generator
Train brakes Vacuum
Career British Railways
Number D800–D832, D866–D870
Axle load class Route availability 7 (RA 6 from 1969)
Retired 1968–1972

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.

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