Under the Whyte notation system, a steam locomotive that has an unpowered three-axle leading truck followed by a single powered driving axle.

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

Under the Whyte notation system, a steam locomotive that has two leading wheels, six coupled driving wheels, and two trailing wheels.

(rail transport) Under the Whyte notation system, a steam locomotive that has two leading wheels, six coupled driving wheels, and four 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 a pair of leading wheels followed by six driving wheels, with no trailing wheels.

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

(rail transport) Under the Whyte notation system, a steam locomotive that has four coupled leading wheels, six coupled driving wheels, and a pair of trailing wheels. Also known in UK English as a "Pacific" locomotive.

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.