Single (locomotive)

In railway terminology, a single is a steam locomotive with a single pair of driving wheels. Some sources use 'Single' only for the 2-2-2 type, but more commonly singles could have any number of leading or trailing wheels.

• Crampton locomotive
• GWR 3031 Class
• GNR Stirling 4-2-2

• Winchester, Clarence, ed. (1936), "Some famous singles", Railway Wonders of the World, pp. 1091-1099, http://www.railwaywondersoftheworld.com/singles.html  illustrated description of some famous singles

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