Under the Whyte notation system, a steam locomotive that has two leading wheels arranged in a leading truck, ten coupled driving wheels and four trailing wheels in a trailing truck.

Under the Whyte notation system, a steam locomotive that has four leading wheels on a leading truck followed by ten coupled driving wheels, and no trailing wheels.

Under the Whyte notation system, the simplest form of steam locomotive, with two axles and four driving wheels, and no leading wheels or trailing wheels.

Under the Whyte notation, a steam locomotive that has six coupled driving wheels followed by four trailing wheels, with no leading wheels.

Under the Whyte notation system, a steam locomotive that has two leading wheels arranged in a leading truck, eight coupled driving wheels and four trailing wheels in a trailing truck.

Under the Whyte notation system, a steam locomotive that has two leading wheels arranged in a leading truck, four coupled driving wheels and two trailing wheels in a trailing truck.

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.

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.

Under the Whyte notation system, a steam locomotive that has four leading wheels on a leading truck followed by three sets of coupled driving wheels, and no trailing wheels.

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