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Union Pacific > 4-6-6-4 "Challenger"

4-6-6-4 No. 3977 of UP at North Platte

4-6-6-4 No. 3985 of UP between Brule and Ogallala

4-6-6-4 No. 3985 of UP between Lodgepole and Chappell

4-6-6-4 No. 3985 of UP between Sidney and Lodgepole

4-6-6-4 No. 3985 of UP between Potter and Brownson

4-6-6-4 No. 3985 of UP between Potter and Brownson

4-6-6-4 No. 3985 of UP between Potter and Brownson

4-6-6-4 No. 3985 of UP between Dix and Potter

4-6-6-4 No. 3985 of UP between Cheyenne and Egbert