4-8-8-4
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Union_Pacific_Big_Boy_No._4014_in_Pine_Bluffs%2C_Wyoming_July_2023.png/220px-Union_Pacific_Big_Boy_No._4014_in_Pine_Bluffs%2C_Wyoming_July_2023.png)
English
[edit]Noun
[edit]- Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of eight driving wheels, and four trailing wheels on a trailing truck.