British Rail Class 23

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English Electric Type 2
British Rail Class 23
“Baby Deltic” D5901 with the revised cab front.
Power type Diesel-electric
Builder English Electric at Vulcan Foundry
Build date 1959
Total production 10
Configuration Bo-Bo
UIC classification Bo'Bo'
Gauge ft 8+12 in (1,435 mmstandard 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)
Locomotive 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
Multiple working Blue star
Top speed 75 mph (121 km/h)
Power output Engine: 1,100 hp (820 kW)
Tractive effort Maximum: 47,000 lbf (209.1 kN)
Train heating Steam
Train brakes Vacuum
Career British Railways
Number D5900–D5909
Nicknames Baby Deltic
Axle load class Route availability

The British Rail Class 23 Bo-Bo Diesel-electric locomotives (also called 'Baby Deltics') were a ten strong class of locomotives built by the English Electric Company in 1959. They were numbered from D5900 to D5909. The power unit used was a Napier Deltic T9-29 9 cylinder engine of 1,100 bhp driving an EE generator, which powered the four traction motors.