This article is about diesel locomotives built 1958-1960. For 1990s-era locomotives used by EuroCargo Rail and Eurotunnel, see
British Rail Class 21 (MaK).
North British Type 2 diesel-electric
British Railways Class 21 |
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D6103 at Harringay West in 1959. |
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| Specifications |
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Configuration:
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| • UIC | Bo'Bo' |
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| • Commonwealth | Bo-Bo |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Wheel diameter | 3 ft 7 in (1,092 mm) |
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| Minimum curve | 3.5 chains (231 ft; 70.4 m) |
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| Wheelbase: | |
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| • Engine | 37 ft 0 in (11,278 mm) |
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| • Bogie | 8 ft 6 in (2,591 mm) |
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| Pivot centres | 28 ft 6 in (8,687 mm) |
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Length:
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| • Over buffers | 51 ft 6 in (15,697 mm) |
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| Width | 8 ft 8 in (2,642 mm) |
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| Height | 12 ft 8 in (3,861 mm) |
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| Loco weight | 72.5 long tons (73.7 t; 81.2 short tons) |
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| Fuel capacity | 460 imp gal (2,100 L; 550 US gal) |
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| Prime mover | MAN L12V18/21S |
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| Generator | DC |
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| Traction motors | 4 × GEC WT440 |
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| Transmission | Diesel electric |
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| MU working | D6100–D6137: ● Red circle
D6138–D6157: ★ Blue star |
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| Train heating | Spanner 1,500 pounds (680 kg) per hour Steam generator |
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| Train brakes | Vacuum |
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The British Rail Class 21 was a type of Type 2 diesel-electric locomotive built by the North British Locomotive Company in Glasgow for British Rail in 1958–1960. They were numbered D6100-D6157. Thirty-eight of the locomotives were withdrawn by August 1968; the rest were rebuilt with bigger engines to become Class 29, although those locos only lasted until 1971.
