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 Mallet-type locomotive with two leading wheels on a leading truck, two sets of ten driving wheels, and two trailing wheels on a trailing truck.

plural of 2-10-10-2

plural of 2-10-0

plural of 2-12-0

plural of 2-10-4