Union Pacific 3977

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Union Pacific 3977
Power type Steam
Configuration4-6-6-4
Gaugeft 8½ in (1435 mm)
CareerUnion Pacific
Number3977
Nicknames"Challenger"
DispositionOn static display

Union Pacific 3977 or UP 3977 is a 4-6-6-4 steam locomotive originally owned by Union Pacific Railroad. Its counterpart, Union Pacific 3985, is the largest operating steam locomotive in the world. 3977 was donated to the City of North Platte, Nebraska for display on October 19, 1968.

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Historic/preserved locomotives owned by Union Pacific
Steam locomotives: 844 (4-8-4) · 1243 (4-6-0) · 3985 (4-6-6-4)
Diesel locomotives: 951 (E9) · 1234 (SW10) · 6936 (DDA40X)