On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive).
The Glasgow and South Western Railway (G&SWR) was a railway company in Scotland.
The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels.
Patrick Stirling (29 June 1820 – 11 November 1895) was a Scottish railway engineer, and Locomotive Superintendent of the Great Northern Railway of England.
A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine.
On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle (wheelset) located behind the driving wheels.
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive.
The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte, and came into use in the early twentieth century following a December 1900 editorial in American Engineer and Railroad Journal.