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Definition of 4-6-6-4
1. Noun. Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and four trailing wheels on a trailing truck. ¹
¹ Source: wiktionary.com
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1. Noun. Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and four trailing wheels on a trailing truck. ¹
¹ Source: wiktionary.com