The train, No. 4014, is the only operational one of 25 special trains built in the 1940s. Built on massive 4-8-8-4 wheel sets, the locomotives hauled cargo up steep mountain passes in Utah and ...

Union Pacific No. 4014, better known as "Big Boy," will start its 2024 tour on Aug. 28 in Cheyenne, Wyoming, and will work its way across nine states, including Oklahoma in October.

Editor's Note: Tuesday's timing schedule for the Union Pacific 4014 Big Boy in Nokomis, Illinois has changed. The latest information can be found here. Our original story continues below.

Late last month, Union Pacific Big Boy No. 4014 launched its "Heartland of America" tour, giving train lovers in 10 states the chance to see the classic steam engine in real life.