British Rail Class 22

North British Type 2 diesel-hydraulic British Rail Class 22
A Class 22 at Old Oak Common, 1965
Type and origin Power type Diesel-hydraulic Builder North British Locomotive Co. Build date 1959–1962[1] Total produced 58
Specifications Configuration: ​  • UIC B'B'  • Commonwealth B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 6 in (1.067 m) Minimum curve 4.5 chains (300 ft; 91 m) Wheelbase Bogies: 8 ft 6 in (2.59 m) Bogie centers: 23 ft (7.0 m) Total: 34 ft 6 in (10.52 m) Length 46 ft 8+1⁄2 in (14.237 m) Width 8 ft 8 in (2.64 m) Height 12 ft 10 in (3.91 m) Loco weight D6300–D6305: 68 long tons (69 t)[2] D6306–D6357: 65 long tons (66 t) Fuel capacity 450 imp gal (2,000 L; 540 US gal) Prime mover D6300-D6305, NBL / MAN L12V18/21A 1,000 bhp (750 kW) at 1445 rpm[3] D6306-D6357, NBL / MAN L12V18/21BS 1,100 bhp (820 kW) at 1530 rpm Transmission Hydraulic: Voith / NBL LT.306r MU working D6300–D6305: ■ Orange square D6306–D6357: ◆ White diamond Train heating 1,000 pounds (454 kg) per hour steam generator[4] 500 imp gal (2,300 L; 600 US gal) capacity Loco brake Vacuum controlled air brake, hand brake
Performance figures Maximum speed 75 mph (121 km/h) Tractive effort 38,000 lbf (170,000 N) @ 25% adhesion
Career Operators British Rail Numbers D6300–D6357 Nicknames Baby Warship Axle load class GWR: ●Blue[5] BR: Route availability 4[6] Retired 1967–1972[1] Disposition All scrapped
Sources:[7] except where noted

The British Rail Class 22 or "Baby Warship" was a class of diesel-hydraulic locomotives designed for the Western Region of British Railways and built by the North British Locomotive Company. They were very similar in appearance to the Class 21 diesel-electrics, although shorter in length by almost five feet. The nickname Baby Warship related to the similarity in appearance (and internal equipment) to the British Rail Class D20/2 or Class 41 Warship Class. The Class 22s were numbered D6300-D6357.^[8]