British Rail Class D20/2

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British Rail Class D20/2
Type and origin
Power type Diesel-hydraulic
Builder North British Locomotive Co.
Serial number 27660–27664
Build date 1958–1959
Total produced 5
 • Whyte A1A-A1A
 • UIC (A1A)'(A1A)'
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter Driving: 3 ft 7 in (1.092 m)
Idling: 3 ft 3 12 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)
Railroad(s) British Railways
Number D600–D604
Nicknames “Warships”
Axle load class Route availability
Retired December 1967
Disposition All scrapped

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 Although never assigned a TOPS class as they were withdrawn before TOPS was introduced British Loco enthusiasts coined the term "Class 41". All were named after Royal Navy vessels, hence the nameplates each bore a subtitle "Warship Class".