What is the big boy train called?

Union Pacific 4014 is a steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. It is a four-cylinder simple articulated 4-8-8-4 Big Boy type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works.



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Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. Of the eight remaining Big Boys in existence, No. 4014 is the only one operating today. The Big Boys were about 133 feet long and weigh 1.2 million pounds.

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Its girth requires a 4-8-8-4 wheel configuration to keep it rock-steady on the rails. With a puny 7,000 horsepower, Big Boys had a maximum tractive power of 135,375 pounds, all to pull huge loads of freight across steep grades in Utah's Wasatch Mountains and the Rockies.

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Therefore I say it was and is the largest steam engine that was ever created... There was a machine called the Allegheny type which I think was a 4-6-6-6 which some believe was actually more powerfull and heavier than the Big Boy.

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Union Pacific 4014 is a steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. It is a four-cylinder simple articulated 4-8-8-4 Big Boy type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works.

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Union Pacific's Big Boy No. 4014 will return to the rails this week for a nearly month-long tour of Wyoming, Nebraska, and Iowa as it travels to Omaha, where it will be on display for the NCAA Men's College World Series in mid-June.

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