6-4-4-6 Definition
noun
Under the Whyte notation system, a duplex steam locomotive that has six coupled leading wheels in a leading truck, two sets of four driving wheels, and a six coupled trailing wheels in a trailing truck.
Wiktionary
Other Word Forms of 6-4-4-6
Noun
Singular:
6-4-4-6
Plural:
6-4-4-6s
