America in Photos: Big Boy Locomotive Journey, Queen Mary Anniversary Celebration, and 100 Years of Marilyn Monroe

People gather along the railroad tracks to watch as Union Pacific’s Big Boy No. 4014, the world’s largest operating steam locomotive, makes a stop in the city's downtown during its cross-country journey to celebrate America's 250th birthday in Colo., Neb., on May 29, 2026. Between 1941 and 1944 Union Pacific commissioned 25 Big Boy locomotives, and eight still remain, but the restored 4014 is the only one that is fully operational. (Scott Olson/Getty Images)