What kind of engine is this that is off center like that?
The Union Pacific Challenger, it has a wheel config 4-6-6-4 unlike the Big Boy 4-8-8-4 the challenger was a little bit more maneuverable on tighter curves of the mountains, then the big boy. The Big Boy mainly operated on the plains no mountains or curves, that's why even the Norfolk & Western had similar type 2-6-6-4.
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Photo taken in North Platte, NE 69101, USA
Misplaced? Suggest new location