British Rail Class 22

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North British Type 2 diesel-hydraulic
British Rail Class 22
D6343 with Hymek D7072 at Old Oak Common, 1965.
Power type Diesel-hydraulic
Builder North British Locomotive Co.
Build date 1959–1962
Total production 58
Configuration B-B
UIC classification B'B'
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter 3 ft 7 in (1.092 m)
Wheelbase 31 ft 6 in (9.60 m)
Length 46 ft 8 12 in (14.237 m)
Width 8 ft 8 in (2.64 m)
Height 12 ft 10 in (3.91 m)
Locomotive weight D6300–D6305: 68 long tons (69.1 t)
D6306–D6357: 65 long tons (66.0 t)
Fuel capacity 450 imp gal (2,000 l; 540 US gal)
Prime mover MAN L12V18/21A or 21B
Transmission Hydraulic: Voith LT306r
Multiple working D6300–D6305: Orange square
D6306–D6357: White diamond
Top speed 75 mph (121 km/h)
Power output Engine: 1,000 hp (746 kW) or 1,100 hp (820 kW)
Tractive effort Maximum: 40,000 lbf (177.9 kN)
Train heating 1,000 pounds (450 kg) per hour steam generator
Train brakes Vacuum
Career British Railways
Number D6300–D6357
Nicknames Baby Warship
Axle load class GWR: Yellow
BR: Route availability 4
Retired 1967–1972
Disposition All scrapped

The British Rail Class 22, or "Baby Warship", was a class of diesel-hydraulic locomotives designed for the Western Region and built by North British Locomotive Company. They were very similar in appearance to the Class 21 diesel-electrics.