2-2 Definition

noun

Under the Whyte notation system, a steam locomotive that has one unpowered leading axle and one powered driving axle.

Wiktionary

Under the Whyte notation system, a steam locomotive that has two leading wheels, two driving wheels and two trailing wheels.

Wiktionary

Under the Whyte notation system, a steam locomotive that has two leading wheels followed by two coupled driving wheels and four trailing wheels.

Wiktionary

Other Word Forms of 2-2

Singular:

2-2

Plural:

2-2-0s, 2-2-2s, 2-2-4s