4-2-2

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'.

[edit] Examples from the UK

The Iron Duke of Great Western Railway, built by Daniel Gooch. This broad gauge express locomotives were first built in 1847 and had an 8 ft diameter leading wheel size.
The later examples of the GWR 3031 Class by William Dean, 1893-1899, built for standard gauge. No 3065 Duke of Connaught made a record-breaking run with the Ocean Mail express train on 9 May 1904, covering the distance from Plymouth to Paddington in 227 minutes.
The GNR Stirling 4-2-2 of the Great Northern Railway, which ran an average speed of more than 60 mph during the race to the north, built first in 1870. They were called eight-footer because of the big leading wheel, that was more than 8 ft. in diameter.
The Midland Railway 4-2-2 No 673 (Spinner) from 1899, still to be seen at the National Railway Museum, York.
Southern Railway T7
A further notable UK class 4-2-2 is the Holden P43, which was an early oil-burning engine, developed by the pioneer of oil-boilers, James Holden

Iron Duke class engines waiting scrapping

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.

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