Brandon Hurley Updated June 1, 2026, 11:11 a.m. CT The Union Pacific "Big Boy" steam engine left Boone, Iowa on Monday, June 1, headed to Cedar Rapids. Brandon Hurley/Ames Tribune The Union Pacific "Big Boy" steam engine left Boone, Iowa on Monday, June 1, headed to Cedar Rapids. Brandon Hurley/Ames Tribune See a few people wave at the Union Pacific "Big Boy" steam engine as it left Boone, Iowa on Monday, June 1, headed to Cedar Rapids.