Union Pacific 4014

Big Boy No. 4014 easing out of Denver in July 2025, smoke rolling over the yard, on a run north to Greeley and Cheyenne. The American Locomotive Company built this 4-8-8-4 articulated giant at its Schenectady Works in November 1941, one of a class that measures 133 feet long and weighs 1.2 million pounds. Union Pacific restored it in 2019 for the 150th anniversary of the transcontinental railroad; eight Big Boys survive, and No. 4014 is the only one that runs. Its 2026 coast-to-coast tour showed how far fans will drive just to watch it pass.