Union Pacific 4-8-8-4
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The only 4-8-8-4 steam locomotives were the Union Pacific 4000 "Big Boy" Class. The UP Big Boys were an expansion of the 4-6-6-4 "Challenger" type articulated locomotive. Although their wheels were an inch (25 mm) smaller than those of the Challengers, they were still able to sustain high speeds. Adding four driving wheels increased the pulling power of the locomotive and reduced the need for helper locomotives over steep grades.
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