From TrainSpottingWorld, for Rail fans everywhere
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, a 4-2-2 locomotive has four leading wheels arranged in a leading truck, two driving wheels and two trailing wheels. The equivalent UIC classification is 2'A1'.

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.