Union Pacific's legendary Big Boy 4014 is the world's largest and most powerful operating steam locomotive.

Big Boy is the largest and most powerful operating steam locomotive in the world, and FOX4 got a look in the cab.

Big Boy 4014 arrives in NEPA on June 13. Each day until then, we're sharing a fascinating fact about the world's largest operating steam locomotive. Big Boy 4014 produces approximately 135,375 pounds ...

One of the largest and most powerful steam locomotives ever built is scheduled to make a brief stop in Kit Carson later this month, bringing a living piece of American railroad history back to the ...

Union Pacific's Big Boy No. 4014, the world's largest steam locomotive, makes a whistle stop at Lebanon Station on Tuesday.

As part of America's 250th birthday celebration, Union Pacific is sending Big Boy, the largest, heaviest and most powerful steam locomotive in the world, across the country. Ian Lee reports.

For the first time, the world's largest steam locomotive is rolling into the Northeast — and it's arriving in Philadelphia just in time for the Fourth of July. Union Pacific's Big Boy locomotive has ...