Union Pacific Challenger No. 3977 on static display in Cody Park, July 6, 2007.

Union Pacific 3977 Builders Photo, circa 1943.

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Union Pacific 3977
Union Pacific 3977 or UP 3977 is a 4-6-6-4 articulated steam locomotive originally owned by Union Pacific Railroad. Its counterpart, Union Pacific 3985, is the largest operating steam locomotive in the world. No. 3977 was donated to the City of North Platte, Nebraska for display on October 19, 1968. It is on display in Cody Park, next to Union Pacific EMD DDA40X No.6922.

Union Pacific 3977 Overview
Type and origin
Power type: Steam
Builder: American Locomotive Company
Serial number: 70160
Build date: June 1943
Specifications
Configuration:
​ • Whyte 4-6-6-4
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Career
Operator: Union Pacific
Numbers: 3977 (coal burner, 1943), 3710 (oil burner, 1952), 900079 (MOW snow melter, 1961) renumbered back to 3977 for display in North Platte 1968.
Nickname: "Challenger"
Retired: 1968
Disposition: On static display

Coordinates:  41.147853°N 100.753113°W

See also:

4-6-6-4 Challenger

Union Pacific

UP 3985

Last of the Giants

Steam Locomotives

American Locomotive Company

Locomotives

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Union Pacific Challenger No. 3977 on static display in Cody Park, July 6, 2007.

Union Pacific 3977 Builders Photo, circa 1943.