4-2-2
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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.
The Midland Railway 115 Class 4-2-2
Technical drawing of the first Borsig locomotive
Iron Duke class engines waiting to be scrapped
T. D. Judah, a locomotive rebuilt as a 4-2-2 by Central Pacific Railroad.
Whyte notation
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The 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 century following a December 1900 editorial in American Engineer and Railroad Journal.
Whyte notation from a handbook for railroad industry workers published in 1906