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

Under the Whyte notation system, a steam locomotive that has one unpowered leading axle and one powered driving axle.

Under the Whyte notation system, a steam locomotive that has a four-wheel leading truck followed by a single driving axle.

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, a steam locomotive that has four coupled driving wheels followed by four trailing wheels, with no leading 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, a steam locomotive that has four coupled driving wheels followed by two 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 a single-axle leading truck followed by four powered driving axles, and no trailing wheels. Its popular name is "Consolidation" as its appearance coincided with the consolidation of several Eastern coal railroads. The Consolidation was extremely popular, especially in the first quarter of the 20th century.