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).
Other equivalent classifications are:
- UIC classification: 1F1 (also known as German classification and Italian classification)
- French classification: 161
- Turkish classification: 68
- Swiss classification: 6/8
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