Under the Whyte notation system, a Mallet-type locomotive with two leading wheels on a leading truck, two sets of six driving wheels, and no trailing wheels.

Under the Whyte notation system, an articulated locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and four trailing wheels on a trailing truck.

Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and two trailing wheels on a trailing truck.

plural of 2-6-6-4

plural of 4-6-6-4

plural of 2-6-6-6

plural of 0-6-6-0

plural of 4-6-6-2

plural of 2-6-6-0

plural of 2-6-6-2