Union Pacific Railroad Steam

Union Pacific steam locomotives 844 and Big Boy 4014 are both based at the Union Pacific Steam shops in Cheyenne Wyoming. Locomotive 844 is one of the only steam engines in the country that has never been retired since being built in the late 1940s. Big Boy 4014 is the largest operating steam locomotive in the country. You can follow the Union Pacific steam schedule for when one of these engines are scheduled to run.