British Rail Class 28

Ranked #83 on the list Best Locomotive class of All Time

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About British Rail Class 28

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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 1955 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 (220 kN) was unusually high for a Type 2 locomotive but, as there were five (not four) driving axles, the risk of wheelslip was minimal. With low-speed Crossley 8-cylinder HST Vee8 two stroke engines, they represented an experiment in two stroke versus four stroke engines for diesel-electric traction. The engines had exhaust pulse pressure charging and developed 1,200 horsepower (895 kW) at 625 rpm. There were no valves, and inlet and exhaust were via ports in the cylinder walls. The same engine was originally fitted in the Irish A Class and the Western Australian Government Railways X class Almost from the beginning the

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