4-8-0 Definition
noun
Under the Whyte notation system, a steam locomotive that has four leading wheels on a leading truck followed by four sets of coupled driving wheels, and no trailing wheels.
Wiktionary
Under the Whyte notation system, a steam locomotive that has four leading wheels arranged in a leading truck, eight coupled driving wheels and two trailing wheels in a trailing truck.
Wiktionary
Under the Whyte notation system, a steam locomotive that has four leading wheels arranged in a leading truck, eight coupled driving wheels and four trailing wheels in a trailing truck.
Wiktionary
Under the Whyte notation system, a steam locomotive that has four leading wheels arranged in a leading truck, eight coupled driving wheels and six trailing wheels in a trailing truck. The C&O had one planned as their class J4, but it was never built.
Wiktionary