The gritty vibe of the refineries in Commerce City, Colorado lends itself to imagining what the Big Boy would have looked like 70 years ago leaving Denver and heading home to Cheyenne, Wyoming.

Dawn is breaking at Sharon Springs, Kansas as the crew starts to prep UP 4014 for the run to Denver, Colorado.

Union Pacific Big Boy 4014 runs between the cottonwood trees at Aroya, Colorado.

The "Big Boy" arrives in St. Louis during its 2021 Tour.

UP 4014 departing Sharon Springs, KS headed for Denver, CO.

Union Pacific Big Boy 4014 leads the Union Pacific Museums Benefit Excursion over the Huey P. Long bridge and out of New Orleans as it begins the next leg of its 2021 Tour.

The early bird photographer gets the sunrise shot of UP Big Boy 4014 as it sits in Sharon Springs, Kansas.

Big Boy 4014 runs across a large span bridge in Peoria, Colorado.

UP Big Boy 4014 leaves Denver behind as it travels north on the Greeley Sub, passing between the refineries of Commerce City.

Everybody Loves a Big Boy!
UP's Big Boy made the second-to-last leg of its 2021 summer journey from Sharon Springs, KS to Denver, CO on Sunday, September 5, 2021. As is typical, the tr... (more)

UP Big Boy 4014 meets a UP Freight in Arapahoe, Kansas.

UP 4014 leaves Sharon Springs, Kansas under ominous clouds. As with the other stops on the tour, the Big Boy draws large crowds who are amazed at the size.

Reflections of UP 4014 at Sharon Springs, Kansas. Photographers, admirers and kids of all ages showed up at Sharon Springs early in the morning to see the Big Boy locomotive and watch it leave fo... (more)

Union Pacific Big Boy 4014 rolls west across the Gasconade River on the Jeff City Sub.

UP 4014 is back on the move after stopping in Strasburg. Next stop, Denver.