Union Pacific 3985

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Union Pacific 3985
Union Pacific 3985
Power type Steam
Configuration 4-6-6-4
Gauge ft 8½ in (1435 mm)
Career Union Pacific
Number 3985
Nicknames "Challenger"
Disposition operates in occasional excursion service

Union Pacific 3985 or UP 3985 is a 4-6-6-4 steam locomotive owned by Union Pacific Railroad. It is the largest operating steam locomotive in the world. It was originally retired and placed on display, but later a group of UP volunteers overhauled it and returned it to operable condition. It is now used for excursion trains and occasionally mainline freight. It is one of only two "Challenger" types in existence, the other being UP 3977 on display in North Platte, Nebraska.

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