Under the

Whyte notation Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twentieth cen ...

for the classification of steam locomotives, 2-2-4-0T represents the

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

of two

leading wheel 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. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used ...

s on one axle, two

driving wheels 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). On a conventional, non-articulated locomotive, the driving wheels are all coupled to ...

powered from the inside cylinders, four coupled driving wheels powered from the outside cylinders but no

trailing wheel On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...

Usage

This unusual wheel arrangement appears only ever to have been used on one divided drive

compound Compound may refer to: Architecture and built environments * Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall ** Compound (fortification), a version of the above fortified with defensive struc ...

tank locomotive A tank locomotive or tank engine is a steam locomotive that carries its water in one or more on-board water tanks, instead of a more traditional tender. Most tank engines also have bunkers (or fuel tanks) to hold fuel; in a tender-tank locom ...

designed by Francis Webb of the London and North Western Railway, No. 777 in 1887. The type does not appear to have been successful since only one was ever built and this was withdrawn in 1901.Bertram Baxter, ''British locomotive catalogue 1825-1923'', Vol.2B Moorland, 1979), p.210. File:LNWR engine No.2974, Fourth Comp. 2-2-4-0 Tank Class.jpg, File:The railroad and engineering journal (1887) (14571870687).jpg, Sectioned File:The railroad and engineering journal (1887) (14760556992).jpg,

References

{{Whyte types Whyte notation London and North Western Railway locomotives