2-12-2

Under the Whyte notation for the classification of steam locomotives, 2-12-2 represents the wheel arrangement of two leading wheels on one axle (usually in a leading truck), twelve powered and coupled driving wheels on six axles, and two trailing wheels on one axle (usually in a trailing truck).

Equivalent classifications
Other equivalent classifications are:
 * UIC classification: 1F1 (refined to 1'F1') (also known as German classification and Italian classification)
 * French classification: 161
 * Turkish classification: 68
 * Swiss classification: 6/8

Austria
The Deutsche Reichsbahn and later the Austrian Federal Railways operated two Class 97.4 2-12-2T tank locomotives, both built in 1941.

Indonesia
Hanomag and Werkspoor built a cumulative total of 28 JSS 800, came in 1912-1920. The JSS 800s (2-12-2Ts or 1F1 in UIC notation) also known as Javanic had been used by the Staatsspoorwegen in freight service in Java and Sumatra, Dutch East Indies, now Indonesia. They were assigned the railroad numbers 801-823 and H130-134. After Indonesian Independence, they were renumbered as F1001-F1026 by Indonesian State Railways.