OMAHA, Neb.--(BUSINESS WIRE)--Union Pacific Railroad's iconic Big Boy No. 4014, the world's largest operating steam locomotive, will journey between Wyoming and Colorado later this month. The limited excursion will offer rail fans another opportunity to see the railroad's rich history in action. "The Big Boy not only represents Union Pacific Railroad's rich history, it symbolizes who we are as a railroad – built on strength, innovation and grit,†said CEO Jim Vena. "It's an important connector. ...