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In Whyte notation, a 2-2-4T is a steam locomotive that has two leading wheels followed by two coupled driving wheels and four trailing wheels. This was an unusual wheel arrangement, only used on a few specialised locomotives. This wheel arrangement is only used for tank locomotives.

Equivalent classifications

Other equivalent classifications are:

• UIC classification: 1A2 (also known as German classification and Italian classification)
• French classification: 112
• Turkish classification: 14
• Swiss classification: 1/4

UK examples

In the United Kingdom, the North Eastern Railway, had four tank locomotives of this wheel arrangement, all of which had previously been rebuilt from other types. They were: No. 66 Aerolite rebuilt as a 2-2-4T in 1902 and later known as in LNER class X1; No. 957, which had been rebuilt from a BTP class 0-4-4T in 1903 and later classified as X2 class. NER 190 Class, later class X3 had two members, Nos. 190 and 1679, both rebuilt from 2-2-2 tender locomotives. All four were inherited by the London and North Eastern Railway (LNER) at the time of its formation on 1 January 1923, and withdrawn from service between 1931 and 1937. No. 66 Aerolite has been preserved at the National Railway Museum in York.

References

1. Boddy, M. G.; Brown, W. A.; Fry, E. V.; Hennigan, W.; Hoole, Ken; Manners, F.; Neve, E.; Platt, E. N. T.; Proud, P.; Yeadon, W. B. (June 1977). Fry, E. V. (ed.). Locomotives of the L.N.E.R., Part 9B: Tank Engines—Classes Q1 to Z5. Kenilworth: RCTS. p. 58. ISBN 0-901115-41-X.

• 2-2-4T locomotives
• Whyte notation
• Tank locomotives