Big Boy,” a 1.2 million-pound locomotive, is back in Colorado after being restored to the world’s largest operating steam locomotive — and there’s one more chance to see it this weekend.

The Big Boy No. 4014 steam locomotive rolled out of a Union Pacific restoration shop in Cheyenne over the weekend for a big debut after five years of restoration. It then headed toward Utah as part of ...

The world's largest operating steam train is in Denver. Union Pacific's legendary Big Boy No. 4014 locomotive made a pit stop in the Mile High City on Friday.

Twenty-five Big Boys were built during World War II, but only eight survived. No. 4014 is the only one of the eight still in operation and remains the world’s largest operating steam locomotive. UP ...

OMAHA, Neb., May 27, 2025--Union Pacific Railroad announced today its legendary steam locomotive, Big Boy No. 4014, will make two whistle-stops in Greeley, Colorado, this summer as part of a ...

Big Boy No. 4014 calls Cheyenne home, along with Union Pacific’s Steam Shop and the other historic locomotive, UP No. 844. Union Pacific also has nearly 800 employees in Wyoming.

Union Pacific’s (UP) Big Boy No. 4014 locomotive may be forever tied to Earth, but one astronaut believes the famed steam engine shares a lot in common with mankind’s drive to explore the heavens. Big ...

Union Pacific Railroad CHICAGO, July 31, 2019 — Enthusiasts gather near the historic Big Boy No. 4014 steam locomotive in West Chicago, Illinois, the United States, on July 29, 2019.

Big Boys hauled freight between Wyoming and Utah in the 1940s and 1950s. Of the 25 built by the American Locomotive Company in Schenectady, New York, from 1941 to 1944, eight remain.