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4-2-2

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T. D. Judah, a locomotive rebuilt as a 4-2-2 by Central Pacific Railroad.

Under the Whyte notation for the classification of steam locomotives, 4-2-2 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and two trailing wheels on one axle.

Other equivalent classifications are:
UIC classification: 2A1 (also known as German classification and Italian classification)
French classification: 211
Turkish classification: 14
Swiss classification: 1/4

Like other steam locomotive types with single pairs of driving wheels, they were also known as singles.

Examples from the UK

Iron Duke class engines waiting scrapping

Examples from Germany

Technical drawing of the first Borsig locomotive
  • The first steam locomotive made by Borsig, Berlin, the Borsig No 1, was an 4-2-2, built 1841.


Steam locomotive wheel arrangements (Whyte notation)
Single engine types
Divided drive and
Duplex engine types
Articulated locomotives
Fairlie, Meyer
and Garratt types
Articulated locomotives
Mallet types
Articulated locomotives
Triplex and other Multiplex types
Articulated locomotives
Engerth types
Geared locomotives
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