(music) A meter of six eighth notes per measure, usually with secondary stress on the fourth eighth note.

Under the Whyte notation system, a steam locomotive that has six leading wheels arranged in a leading truck, eight coupled driving wheels and six trailing wheels in a trailing truck.

plural of 6-8-6

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 2-6-8-0