Union Pacific's famed Big Boy No. 4014, the world's largest operating steam locomotive, will journey to the East Coast this summer for the first time as part of a historic coast-to-coast tour to celebrate America's 250th anniversary. The tour includes a Fourth of July celebration in Philadelphia, major display events in eight cities and more than 50 whistle-stops in 10 states, including stops for the first time in Indiana, Ohio, New York and Pennsylvania.