During World War II Union Pacific operated some of the most modern and powerful steam locomotives ever built. Among them were the famous "Big Boys," the largest steam locomotives in the world. Working with them were the "800-class" high-speed passenger locomotives, as well as hundreds of older class steam engines. Union Pacific's steam legacy continues today with the preservation and operation of its historic fleet – No. 844 and No. 4014.


Big Boy No. 4014 visited Omaha on the "Home Run Express" in June 2023!

2023 Home Run Express Route Map for Big Boy No. 4014 | S

Big Boy #UP4014 is making 19 whistle-stops in five states this summer during its 2024 Westward Bound Tour from Wyoming to California. In addition, this mighty steam locomotive will be on public display for two days each in Roseville (July 12-13) and Ogden (July 20-21).


Where are our Steam Locomotives right now?


Steam Club members get the latest news and scheduling information about Union Pacific's legendary steam train program!

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Bringing the Big Boy Back to Life

Union Pacific Steam Shop Tour

Trace the progress of Union Pacific and Central Pacific railroads as they raced to complete the transcontinental railroad and discover the communities they created along the way.

Explore the Great Race website