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.

Thursday The Union Pacific’s Big Boy 4014 steam locomotive will make a two-whistle stop from 11:30 a.m. to noon at the railroad crossing by the Colorado Model Railroad Museum, 680 10th St., Greeley.

Big Boy No. 4014 made its way to Denver Thursday, where it wasn't available for public viewing but where Airtracker7 was able to get a glimpse from the sky.

“Big Boy,” a 1.2 million-pound locomotive, is back in Colorado after being restored to the world’s largest operating steam locomotive.

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“Big Boy,” a 1.2 million-pound locomotive, is back in Colorado after being restored to the world’s largest operating steam locomotive.

The world's largest steam locomotive chugged through Colorado Thursday as part of its limited summer tour. Here are some of ...

Big Boy No. 4014 and Lincoln Locomotive No. 1616 last week rode the rails together for the first time as part of a limited ...

Union Pacific's famed Big Boy No. 4014, the world's largest steam locomotive, returns to the rails Wednesday for its Home Run Express Tour to Omaha, where it will be on display for 11 days during ...

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