Core Viewpoint - Union Pacific Railroad is celebrating America's 250th anniversary with new locomotives and a Big Boy steam tour to the East Coast [1] Group 1: Company Initiatives - Union Pacific Railroad plans to unveil two new locomotives as part of its celebration [1] - The Big Boy steam locomotive, recognized as the world's largest operating steam locomotive, will embark on a journey to Philadelphia for the Fourth of July [1] Group 2: Event Details - The Big Boy steam tour will include stops in Illinois, Indiana, and Ohio before reaching Philadelphia [1]