Definition of the noun 2-6-6-4
What does 2-6-6-4 mean as a name of something?
- Under the Whyte notation system, a Mallet-type locomotive with two leading wheels on a leading truck, two sets of six driving wheels, and four trailing wheels on a trailing truck.
2-6-6-4: In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-6-6-4 is a locomotive with a two-wheel leading truck, two sets of six driving wheels, and a four-wheel trailing truck. All 2-6-6-4s have been articulated locomotives, of the Mallet or related simple articulated type.