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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.
![]() | This article includes a
list of references,
related reading, or
external links, but its sources remain unclear because it lacks
inline citations. (December 2009) |
This article relies largely or entirely on a
single source. (June 2024) |
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.