plural of 0-4-4-0

plural of 0-4-4-2

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 4-8-4 wheel configuration.

plural of 4-8-4+4-8-4