Union Pacific Railroad's iconic Big Boy steam locomotive No. 4014, the world’s largest operating steam locomotive, journed twice through Northern Colorado as part of a limited 2025 steam schedule.
Big Boy No. 4014 will return to the rails in a big way in 2026 to celebrate America's 250th anniversary. Join our Steam Club at http://UP.com/SteamClub to be notified as soon as we have more information to share.
Keep Safety Top of Mind
- Stay back at least 25 feet from all railroad tracks. This includes drones.
- Railroad tracks, trestles, yards and right of way are private property - do not trespass.
- Never assume tracks are abandoned or inactive - ALWAYS expect a train.
- Be a safe and considerate driver - do not pace the train.
- Be Aware of the Environment: While we strive to provide access to all guests, Big Boy is positioned in a working rail environment with uneven walking surfaces that may create difficulty for accessibility.
Union Pacific Steam Club
To be notified when news about Union Pacific's legendary steam program (including future steam excursions by Living Legend No. 844 and Big Boy No. 4014) becomes available, join the Official Union Pacific Steam Club at http://UP.com/SteamClub! Steam club members always get notified first when news about Union Pacific's steam program is released!