4-4-0 Definition

noun
Under the Whyte notation system, a steam locomotive that has four leading wheels on a leading truck followed by two sets of coupled driving wheels, and no trailing wheels.
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(soccer) A popular soccer formation with 4 defenders, 4 midfielders and 2 strikers.

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Under the Whyte notation system, a steam locomotive that has a two-axle leading truck, two powered driving axles and a one-axle trailing truck.
Wiktionary
Under the Whyte notation system, a steam locomotive that has four leading wheels arranged in a leading truck, four coupled driving wheels and four trailing wheels in a trailing truck.
Wiktionary