British Rail Class 21

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North British Type 2 diesel-electric
British Railways Class 21
Power type Diesel-electric
Builder North British Locomotive Co.
Build date 1958–1960
Total production 58
Configuration Bo-Bo
UIC classification Bo'Bo'
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter 3 ft 7 in (1.092 m)
Minimum curve 3.5 chains (70 m)
Wheelbase 37 ft 0 in (11.28 m)
Length 51 ft 6 in (15.70 m)
Width 8 ft 8 in (2.64 m)
Height 12 ft 8 in (3.86 m)
Locomotive weight 72.50 long tons (73.7 t)
Fuel capacity 460 imp gal (2,100 l; 550 US gal)
Prime mover MAN L12V18/21S
Traction motors GEC WT440, 4 off
Transmission DC generator, DC traction motors
Multiple working D6100–D6137: Red circle
D6138–D6157: Blue star
Top speed 75 mph (121 km/h)
Power output Engine: 1,000 hp (746 kW) or 1,100 hp (820 kW)
Tractive effort Maximum: 45,000 lbf (200.2 kN)
Train heating Spanner 1,500 pounds (680 kg) per hour Steam generator
Locomotive brakeforce 50 long tons-force (500 kN)
Train brakes Vacuum
Career British Railways
Number D6100–D6157
Axle load class Route availability 6 (5 from 1969)
Retired 1967–1968
Disposition 20 rebuilt to class 29, remainder scrapped
This is article is about diesel locomotives built 1958-1960. For 2007-era locomotives, see Vossloh G1206.

The North British Type 2 diesel-electric (later known as British RailwaysClass 21) was a type of diesel locomotive built by the North British Locomotive Company in Glasgow for British Railways in 1958-1960.

Starting in 2007, the classification has been reused for new Vossloh G1206 acquired by Euro Cargo Rail/EWS.