Watch full movie online. Union Pacific paid tribute to its Big Boys in a publicity film that has become a sought-out collector"s item for rail enthusiasts worldwide. You"ll see the evolution of UP steam power from 4-6-0s to the development of the articulated locomotive. Then you"ll meet the Big Boys and watch as they are serviced, rebuilt, and run. Trackside and cab shots feature these mighty 4-8-8-4s pulling long freights over Wyoming"s Sherman Hill during their last years in service. This classic film is one you"ll enjoy watching again and again.