PITTSBURGH — Union Pacific Big Boy 4014, the world’s largest operating steam locomotive, reached the East Coast for the first time during a coast-to-coast tour beyond its home system.
Built in 1941 to haul heavy freight across the Wasatch Mountains between Utah and Wyoming, the Big Boy became one of the most recognizable steam locomotives ever constructed. After decades on display, UP 4014 returned to operation in 2019. Its 2026 tour, however, carried the locomotive into territory it had never visited before.
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