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British Railways Type 2 diesel-electric also known as a 'Sulzer 2'
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This locomotive was a British Railways Type 2 diesel-electric, colloquially known as a 'Sulzer 2'. (The Sulzer company manufactured the power units fitted into this class; type 2 was a power-rating code). When accelerating the Sulzer 2 engine made a distinctive clattering sound. This one appears to be hauling a load of limestone.