The Union Pacific Big Boy wasn't just the biggest steam locomotive ever built. It was one of the most terrifying machines in American history. 1.2 million pounds. 300 psi of steam pressure. A boiler carrying the explosive equivalent of 2,600 pounds of TNT. And a cab so hot that crews called it "riding a volcano."
In this video, we break down what made the Big Boy genuinely frightening — from the ground-shaking vibrations felt miles from the tracks, to the 110+ decibel Hancock whistle, to the 1953 Wamsutter derailment that killed three men when Big Boy 4005 hit a misaligned switch at 50 mph.
Big Boy 4014 is currently on its historic 2026 coast-to-coast tour celebrating America's 250th birthday. Track its real-time location at UPSteam.com.
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