World > United States of America > 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