The train, called the "Big Boy," was built in 1941. Only 25 of these trains were ever built, and they are the largest steam engines in the world, Union Pacific said.

The Union Pacific Big Boy No. 4014, the largest steam engine built, chugs across the rail causeway heading east toward Ogden on Friday, July 19, 2024.

The Union Pacific Railroad today announced its famed Big Boy No. 4014 locomotive will stop in more than three dozen communities as part of the 2024 Heartland of America Tour during its fall tour ...

That said, it's still impressive that the Big Boy 4014, a locomotive delivered by Union Pacific Railroad in December of 1941, still holds distinction in the Guinness Book of World Records for the ...

A Union Pacific map for its famed Big Boy No. 4014, the world's largest operating steam locomotive, which will come west during its "Westward Bound" summer tour.

Union Pacific's "Big Boy No. 4014" Locomotive is rolling into Colorado for this weekend. It's the world's largest, restored steam engine and was last in the state in November 2019.

People line the railroad tracks in Crete as Union Pacific’s Big Boy Number 4014 steam engine rolls through as part of its Heartland of America Tour on Sept. 9, 2024.

The world's largest steam engine will roll through the heart of Iowa this fall. The Union Pacific Big Boy No. 4014 will soon depart on its Heartland of America Tour, highlighted by an overnight stop ...

The steam engine will spend the day at a private Union Pacific event. Big Boy No. 4014 will head to Mexia on Thursday, then travel through Navasota and Hempstead before arriving in Houston on ...