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20177 is a BR Class 20 [[UIC classification | Bo-Bo ]] diesel-electric locomotive, otherwise known as an English Electric Type 1. 228 of these locomotives were built between 1957 and 1968. Weighing 73 tonnes and delivering 1,000 horsepower, they were designed to work light mixed freight traffic at up to 75 mph. Members of the class are nicknamed “Choppers” because of the distinctive engine beat under load which resembles the sound of a helicopter.