2-8-8-2

noun1

1. •
   Under the Whyte notation system, a Mallet-type locomotive with two leading wheels on a leading truck, two sets of eight driving wheels, and two trailing wheels on a trailing truck.

   • The leading engine was one of the Class Y6 2-8-8-2 compound articulateds, […] The stack noise of one of these great brutes slogging up a grade was quite unforgettable. — 1961