"The World's Largest Operating Steam Locomotive"

Union Pacific's steam locomotive #3985 is the largest operating locomotive in the world. This 4-6-6-4 locomotive, built in 1943 still runs today as part of the railroad's public relations program.

In this video you will follow the 3985, which is also called the Challenger, in Wyoming, Nebraska, Iowa, Missouri, Illinois, Oklahoma and Texas as she shows the public what big steam was really like. Visit the Cheyenne Steam Shop to see where 3985 is maintained and see some of the historic equipment still in the roundhouse. Includes chapter menus.