JieStar Big Boy Locomotive Static Model #JS59005This set is designed for static display. Major reworking would be required to convert to a motorized unit. Includes straight track. The Union Pacific Big Boy is a type of simple articulated 4 8 8 4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the Union Pacific Railroad in revenue service until 1962. The 25 Big Boy locomotives were built to haul freight over the Wasatch Range between