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 slightly smaller "Challenger" freight engines and 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, No. 4014 and No. 3985.


150th Anniversary of the Transcontinental Railroad's Completion

In the spring of 2019, Union Pacific's historic steam equipment will embark on a special journey along the transcontinental route.


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

Find out more

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