British Rail DP1

Specifications
Specifications
Configuration:;
• UIC	Co′Co′
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	3 ft 7 in (1,092 mm)
Pivot centres	44 ft (13 m)
Length:;
• Over beams	66 ft (20 m)
Width	8 ft 9.5 in (2.680 m)
Height	12 ft 10.5 in (3.924 m)
Loco weight	106 long tons (108 t; 119 short tons)
Fuel capacity	800 imp gal (3,600 L; 960 US gal)
Prime mover	2 x Napier Deltic E158 D18-12
Engine type	opposed piston two-stroke diesel
Generator	2 x 1100 kW
Traction motors	6 x EE 526/A
Cylinders	2 x 18
Transmission	Diesel electric
Train heating	Stone-Vapor/Clarkson steam generator

Type and origin
Type and origin
Power type	Diesel-electric
Builder	English Electric at Dick, Kerr & Co Works, Preston
Serial number	EE: 2003
Build date	1955

English Electric *DELTIC* prototype
English Electric DELTIC prototype
	DP1 at Harringay station in 1959 in blue livery.
Power type
Type and origin
Power type	Diesel-electric
Builder	English Electric at Dick, Kerr & Co Works, Preston
Serial number	EE: 2003
Build date	1955
Configuration:;
Specifications
Configuration:;
• UIC	Co′Co′
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	3 ft 7 in (1,092 mm)
Pivot centres	44 ft (13 m)
Length:;
• Over beams	66 ft (20 m)
Width	8 ft 9.5 in (2.680 m)
Height	12 ft 10.5 in (3.924 m)
Loco weight	106 long tons (108 t; 119 short tons)
Fuel capacity	800 imp gal (3,600 L; 960 US gal)
Prime mover	2 x Napier Deltic E158 D18-12
Engine type	opposed piston two-stroke diesel
Generator	2 x 1100 kW
Traction motors	6 x EE 526/A
Cylinders	2 x 18
Transmission	Diesel electric
Train heating	Stone-Vapor/Clarkson steam generator
Maximum speed
Performance figures
Maximum 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)
Operators
Career
Operators	British Railways
Power class	Type 5
Numbers	DP1
Official name	Deltic
Retired	March 1961
Disposition	Preserved at the National Railway Museum Shildon

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.

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