BR Class 20 20031
Keighley, Keighley & Worth Valley Railway. (April 2014)
The British Rail (BR) Class 20, otherwise known as an English Electric Type 1, is a class of diesel-electric locomotive. In total, 228 locomotives in the class were built by English Electric between 1957 and 1968, the large number being in part because of the failure of other early designs in the same power range to provide reliable locomotives.
The locomotives were originally numbered D8000–D8199 and D8300–D8327. They are known by railway enthusiasts as “Choppers”, a name derived from the distinctive beat that the engine produced when under load which resembles the sound of a helicopter. British Rail Class 20
Class 20 diesel locomotives were built in 1957-1968 by English Electric at the Vulcan Foundry, Newton-le-Willows or at the Robert Stephenson & Hawthorn works at Darlington. Class 20 locomotives have a maximum tractive effort of 42000 lbf (187 kN) and Class 20 diesels have a maximum speed of 75 mph. Class 20 locomotives only have one cab at one end and consequently they often work in pairs. Class 20 diesel locomotives were built for light to moderately heavy freight trains. Class 20 English Electric Bo-Bo diesel locomotives BR freight diesel locomotives