| English Electric DELTIC prototype |
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| Specifications |
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Configuration:
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| • UIC | Co′Co′ |
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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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| Pivot centres | 44 ft (13 m) |
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Length:
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| • Over beams | 66 ft (20 m) |
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| Width | 8 ft 9.5 in (2.680 m) |
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| Height | 12 ft 10.5 in (3.924 m) |
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| Loco weight | 106 long tons (108 t; 119 short tons) |
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| Fuel capacity | 800 imp gal (3,600 L; 960 US gal) |
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| Prime mover | 2 x Napier Deltic E158 D18-12 |
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| Engine type | opposed piston two-stroke diesel |
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| Generator | 2 x 1100 kW |
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| Traction motors | 6 x EE 526/A |
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| Cylinders | 2 x 18 |
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| Transmission | Diesel electric |
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| Train heating | Stone-Vapor/Clarkson steam generator |
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| Performance figures |
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| Maximum speed | 90 mph (140 km/h)
106 mph (171 km/h) from 1956 |
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| Power output | 3,300 hp (2,500 kW) |
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| Tractive effort | 90 mph gearing: 60,000 lbf (266.89 kN)
106 mph gearing: 52,500 lbf (233.53 kN) |
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English Electric DP1, commonly known as Deltic, is a prototype 3,300 hp (2,500 kW) demonstrator locomotive employing two Napier Deltic engines, built by English Electric in 1955.
The high power of the locomotive at an acceptably low axleload resulted in 22 similar locomotives being ordered by British Railways for use on East Coast Main Line express passenger services, the serial production of which became the British Rail Class 55.
