4-4-4-4

A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. Other equivalent classifications are:UIC classification: 2BB2 (also known as German classification and Italian classification)French classification: 2222Turkish classification: 2424Swiss classification: 2/4+2/4 up to the early 1920s, later 4/8

4-4-4-4

A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. Other equivalent classifications are:UIC classification: 2BB2 (also known as German classification and Italian classification)French classification: 2222Turkish classification: 2424Swiss classification: 2/4+2/4 up to the early 1920s, later 4/8