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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.
Other equivalent classifications are:
- UIC classification: 2A1
- French classification: 211
- Turkish classification: 14
- Swiss classification: 1/4
Like other steam locomotive types with single pairs of driving wheels, they were also known as singles.