single-wheeler

noun

noun

Rail transport, Railways, Transport A steam locomotive with a single driving axle.

It links the time when single-wheelers were still being used on crack expresses to our modern streamline age, when up to the outbreak of war developments both at home and overseas were following thick and fast upon each other.1941 February, O. S. Nock, “The Locomotives of Sir Nigel Gresley: Part 1—G.N.R. 1911-1914”, in Railway Magazine, page 77:

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