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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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Stirling_No_1_4-2-2.jpg/220px-Stirling_No_1_4-2-2.jpg)
See also
editReferences
edit- Winchester, Clarence, ed. (1936), "Some famous singles", Railway Wonders of the World, pp. 1091–1099 illustrated description of some famous singles