British Rail Class 21
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| North British Type 2 diesel-electric British Railways Class 21 |
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| Power type | Diesel-electric |
|---|---|
| Builder | North British Locomotive Co. |
| 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 (11.3 m) |
| Length | 51 ft 6 in (15.7 m) |
| Width | 8 ft 8 in (2.6 m) |
| Height | 12 ft 8 in (3.9 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 LTf (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 Railways’ Class 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.
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