British Rail Class 21 facts for kids

	North British Type 2 diesel-electric; British Railways Class 21
	D6103 at Harringay West in 1959
Builder	North British Locomotive Company
Build date	1958–1960
Total production	58
Configuration	Bo-Bo
UIC classification	Bo'Bo'
Gauge	4 ft 81⁄2 in (1,435 mm) standard 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 British Rail Class 21, originally known as the North British Type 2 diesel-electric, 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.