The Big Boy #4014 steam locomotive crosses the Gasconade River

Big Boy No. 4014 crosses the Gasconade River on Monday in Gasconade. Built in 1941, Big Boy No. 4014 is one of eight Big Boys still in existence today. It is the only one still in operation.

J Thomas Taylor/Missourian

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'A giant magnet': Thousands come to see history in motion as Big Boy thunders through Missouri
'A giant magnet': Thousands come to see history in motion as Big Boy thunders through Missouri

Union Pacific's only working steam engine pulled into Hermann on Monday on its cross-country tour for the America250 celebration

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