British Rail Class 23
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| English Electric Type 2 British Rail Class 23 |
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| “Baby Deltic” D5901 with the revised cab front. | |
| Power type | Diesel-electric |
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| Builder | English Electric at Vulcan Foundry |
| Build date | 1959 |
| Total production | 10 |
| Configuration | Bo-Bo |
| UIC classification | Bo'Bo' |
| Gauge | 4 ft 81⁄2 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 10¾ 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.
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