2-10 Definition

noun
Under the Whyte notation system, a steam locomotive that has a single-axle leading truck followed by five powered driving axles, and no trailing wheels.
Wiktionary
Under the Whyte notation system, a steam locomotive that has two leading wheels, five pairs of coupled driving wheels, and two trailing wheels.
Wiktionary
Under the Whyte notation system, a steam locomotive that has two leading wheels arranged in a leading truck, ten coupled driving wheels and four trailing wheels in a trailing truck.
Wiktionary
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Other Word Forms of 2-10

Noun

Singular:
2-10
Plural:
2-10-0s, 2-10-2s, 2-10-4s