plural of 4-6-4-4

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.

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.

plural of 4-6-6-4

plural of 4-6-6-2

plural of 2-4-6 block

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.

plural of 4-6-2+2-6-4

plural of 6-4-4-6