Union Pacific Big Boy 4014 Passes Through Alton on its Way to St. Louis

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The world’s largest steam locomotive, Union Pacific’s Big Boy No. 4014, passed through Alton at 2:34 p.m. Saturday, July 18, 2026, on its way to St. Louis, where it is scheduled to be on display Sunday, July 19, 2026, at Union Station with free public viewing from 9 a.m. to 3 p.m.