British Rail Class 23

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English Electric Type 2
British Rail Class 23
Class 23 D5901.jpg
“Baby Deltic” D5901 with the revised cab front.
Type and origin
Power type Diesel-electric
Builder English Electric at Vulcan Foundry
Build date 1959
Total produced 10
 • Whyte Bo-Bo
 • UIC Bo'Bo'
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 3 ft 7 in (1.092 m)
Minimum curve 4 chains (80 m)
Wheelbase 40 ft 6 in (12.34 m)
Length 52 ft 6 in (16.00 m)
Width 8 ft 10 34 in (2.71 m)
Height 12 ft 8 in (3.86 m)
Loco weight 74 long tons (75.2 t)
Fuel capacity 550 imp gal (2,500 l; 660 US gal)
Prime mover Napier T9-29 Deltic
Transmission DC generator, DC traction motors
MU working Blue star
Train heating Steam generator
Train brakes Vacuum
Performance figures
Top speed 75 mph (121 km/h)
Power output Engine: 1,100 hp (820 kW)
Tractive effort Maximum: 47,000 lbf (209.1 kN)
Railroad(s) British Railways
Number D5900–D5909
Nicknames Baby Deltic
Axle load class Route availability

British Rail Class 23, originally called English Electric Type 2, was a class of ten diesel-electric locomotives built by the English Electric Company in 1959. They were numbered from D5900 to D5909. The power unit was a Napier Deltic T9-29 9 cylinder engine of 1,100 bhp. This drove an EE generator, which powered the four traction motors. The Class 23 was nicknamed "Baby Deltic" because of its similarity to the Class 55.