(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 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 duplex steam locomotive that has six coupled leading wheels in a leading truck, two sets of four driving wheels, and a six coupled trailing wheels in a trailing truck.

Under the Whyte notation system, a duplex steam locomotive that has four leading wheels in a leading truck followed by four coupled driving wheels, a second set with six coupled driving wheels, and four trailing wheels in a trailing truck.

Under the Whyte notation system, a duplex steam locomotive that has four leading wheels in a leading truck followed by six coupled driving wheels, a second set with four coupled driving wheels, and four trailing wheels in a trailing truck.

plural of 6-4-4-6

plural of 4-6-4-4

Under the Whyte notation system, a Mallet-type locomotive with two 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, 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.