(music) A meter of two quarter notes per measure.

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

Under the Whyte notation system, a steam locomotive that has two leading wheels followed by two sets of coupled driving wheels, and no trailing wheels.

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

(countable) Under the Whyte notation system, a steam locomotive that has a four-wheel leading truck, one powered driving axle and a four-wheel unpowered trailing truck.

Under the Whyte notation system, a steam locomotive that has two leading wheels followed by two coupled driving wheels and four trailing wheels.

plural of 2-4-0

plural of 2-4-2

plural of 2-4-4

A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 2, 4, and 6 inches long, respectively. 2-4-6 blocks are a larger version of the more common 1-2-3 block.