British Rail Class 28

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Metropolitan Vickers Type 2
British Rail Class 28
Two 'Metrovicks' Nos. D5703 & D5710 passing through Millbrook in 1960
Power type Diesel-electric
Builder Metropolitan-VickersBowesfield Works, Stockton-on-Tees.
Build date 1958–1959
Total production 20
Configuration Co-Bo
UIC classification Co'Bo'
Gauge ft 8+12 in (1,435 mmstandard gauge
Wheel diameter 3 ft 3 12 in (1.003 m)
Minimum curve 3.5 chains (70 m)
Wheelbase 42 ft 9 in (13.03 m)
Length 56 ft 7 12 in (17.26 m)
Width 8 ft 6 in (2.59 m)
Height 12 ft 1 12 in (3.70 m)
Locomotive weight 97 long tons (98.6 t)
Fuel capacity 510 imp gal (2,300 l; 610 US gal)
Prime mover Crossley HST V8
Traction motors Metropolitan-Vickers 137BZ, 5 off
Transmission DC generator, DC traction motors
Multiple working Red Circle
Top speed 75 mph (121 km/h)
Power output Engine: 1,200 hp (895 kW)
Tractive effort Maximum: 50,000 lbf (222 kN)
Train heating Spanner steam generator (railroad) of 1,500 pounds (680 kg) per hour
Train brakes Vacuum
Career British Railways
Number D5700–D5719
Axle load class Route availability 8
Retired December 1967 – September 1969
Disposition One preserved, remainder scrapped

The British Rail Class 28 (Metropolitan-Vickers Type 2) diesel locomotives, or 'Metrovicks' as they were popularly known, were built as part of the British Railways Modernisation plan. The locomotives had a Co-Bo wheel arrangement (a 6-wheel bogie at one end, a 4-wheel bogie at the other) – unique in British Railways practice though not uncommon in other countries, notably Japan. This affected their route availability, due to the different axle loading at each end of the loco, and made maintenance more complicated. The maximum tractive effort of 50,000 lbf was unusually high for a Type 2 locomotive but, as there were five (not four) driving axles, the risk of wheelslip was minimal.