FORT WORTH, Texas - The world's largest operating steam locomotive will be in Fort Worth through the weekend. Union Pacific's Big Boy No. 4014 will chug into Fort Worth to be on display Thursday.

Those in Colorado will need to wait until fall to see the locomotive. The popular Big Boy No. 4014 is the world’s largest ...

There are steam locomotives, and then there’s “Big Boy.” At 604 tons and 132 feet long and with a 4-8-8-4-wheel arrangement, it is the largest, most powerful steam locomotive in the world.

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Union Pacific Big Boy Loco Add-On The Union Pacific Railroad's Big Boy 4-8-8-4 steam locomotive is undoubtedly the beast of American railroading history, and this epitome of heavy haulage is now ...