British Rail DP1
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| English Electric DELTIC prototype | |
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| The nose end of DP1 at Locomotion | |
| Power type | Diesel-electric |
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| Builder | English Electric at Dick, Kerr Works, Preston |
| Serial number | EE: 2003 |
| Build date | 1955 |
| UIC classification | Co'Co' |
| Gauge | 4 ft 81⁄2 in (1,435 mm) |
| Wheel diameter | 3 ft 7 in (1.1 m) |
| Locomotive weight | 106 long tons (108 t) |
| Prime mover | Napier Deltic D18-25 (2 off) |
| Traction motors | EE 526/A, 6 off |
| Cylinders | 18 × 2 |
| Transmission | Diesel Electric |
| Top speed | 90 mph (140 km/h) 106 mph (171 km/h) from 1956 |
| Power output | 3,300 hp (2,500 kW) |
| Tractive effort | 90 mph gearing: 60,000 lbf (266.89 kN) 106 mph gearing: 52,500 lbf (233.53 kN) |
| Train heating | Stone-Vapor/Clarkson steam generator |
| Career | British Railways |
| Power class | Type 5 |
| Number | DP1 |
| Official name | DELTIC |
| Retired | March 1961 |
| Disposition | to Science Museum, London, April 1963 |
DP1, or Prototype Deltic is a demonstrator locomotive built by English Electric in 1955. This locomotive resulted in 22 similar locomotives being ordered by British Rail, which became their Class 55.
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