4-2-2

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.

For usage in video production, see Chroma subsampling.

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.

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