British Rail Class D20/2

British Rail Class D20/2
'Warship' Diesel-hydraulic at Reading (General) on an Up express.
Type and origin Power type Diesel-hydraulic Builder North British Locomotive Company Serial number 27660–27664 Build date 1958–1959 Total produced 5
Specifications Configuration: ​  • Whyte A1A-A1A  • UIC (A1A)'(A1A)' Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter Driving: 3 ft 7 in (1.092 m) Idling: 3 ft 3+1⁄2 in (1.003 m) Wheelbase 50 ft 0 in (15.24 m) Length 65 ft 0 in (19.81 m) Width 8 ft 8 in (2.64 m) Height 12 ft 10 in (3.91 m) Loco weight 117 long tons (119 t) Fuel capacity 800 imp gal (3,600 L; 960 US gal) Prime mover NBL-MAN L12V 18/21S, 2 off Transmission Hydraulic, Voith L306r MU working ■ Orange Square Train heating Steam Train brakes Vacuum
Performance figures Top speed 90 mph (145 km/h) Power output Engines: 1,000 bhp (746 kW) × 2 Tractive effort Maximum: 50,000 lbf (222 kN) Continuous: 39,600 lbf (176 kN) Brakeforce 88 long tons-force (877 kN)
Career Railroad(s) British Railways Number D600–D604 Nicknames “Warships” Axle load class Route availability Retired December 1967 Disposition All scrapped

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The British Railways Class D20/2 diesel-hydraulic locomotives were built by the North British Locomotive Company in Glasgow during 1957 and 1958. Although never assigned a TOPS class as they were withdrawn before TOPS was introduced, British locomotive enthusiasts coined the term "Class 41". All were named after Royal Navy vessels, hence the nameplates each bore a subtitle "Warship Class".

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