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.

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Celebrating the 150th Anniversary of the Transcontinental Railroad's Completion

Union Pacific's historic steam locomotives – Big Boy No. 4014 and the Living Legend No. 844 – are touring the Union Pacific system throughout 2019 to commemorate the transcontinental railroad's 150th anniversary.

The Big Boy's return to the rails is the product of more than two years of meticulous restoration work by the Union Pacific Steam Team. No. 4014 is the world's only operating Big Boy locomotive.

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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

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 150th Anniversary Celebration Events