4-4-2 (locomotive)

4-4-2 (locomotive)

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-4-2 represents a configuration of four leading wheels on two axles, usually in a leading bogie, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle, usually in a trailing truck. This wheel arrangement is commonly known as the Atlantic type.

Other equivalent classifications are:

• UIC classification: 2B1 (also known as German classification and Italian classification)
• French classification: 221 (also known as Spanish classification)
• Turkish classification: 25
• Swiss classification: 2/5