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Definition of 4-2-0
1. Noun. Under the Whyte notation system, a steam locomotive that has a four-wheel leading truck followed by a single driving axle. ¹
¹ Source: wiktionary.com
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1. Noun. Under the Whyte notation system, a steam locomotive that has a four-wheel leading truck followed by a single driving axle. ¹
¹ Source: wiktionary.com