The biggest steam locomotive is whistle-stopping across the U.S.

3 hours ago

Union Pacific's Big Boy No. 4014, the world's largest operating steam locomotive, is touring the U.S. for America's 250th birthday celebration.
The locomotive attracted large crowds at Valley Forge National Historical Park and Philadelphia's Navy Yard, with enthusiasts describing the experience as incredible and once-in-a-lifetime.
Big Boy locomotives were built from 1941 to 1944 for freight hauling; only No. 4014 remains operational after restoration by Union Pacific's Heritage Operations.
Engineer Ed Dickens operates the manually controlled, 7,000-horsepower locomotive and serves as an ambassador, emphasizing safety by urging spectators to stay 25 feet back.
The tour drew nearly 100,000 visitors in Philadelphia and includes stops in multiple states before returning to Wyoming.

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