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 two leading wheels on a leading truck, two sets of six driving wheels, and six trailing wheels on a trailing truck. This arrangement was used only on the C&O which called it the Allegheny and the Virginian, which named it the Blue Ridge.

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

plural of 2-6-6-4

plural of 2-6-6-6

plural of 2-6-6-0

plural of 2-6-8-0

plural of 2-6-6-2

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-6-0 wheel configuration.

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-6-4 wheel configuration.