Big Boy - World's Largest Steam Locomotive

Front:
BIG BOY Mortd's Largest Steam Loeomodtve X4019 4019 LEGO

Back:
P60251 "Big Boy", World's Largest Steam Locomotive. Union Pacific Railroad operated 25 of these giant Mallet Type, 4-8-8-4, Locomotives over mountain grades of western United States in Freight Service. Numbered in the 4000 series, the "Big Boys' reigned supreme in a long list of successful steam power on the U.P. One of the few remaining Models may be at Holiday Park, East Lincolnway, Cheyenne, Wyoming. seen Dunlap-Henline Co., North Platte, Nebr. Publishers by COLOURPICTURE PUBLISHERS, INC., Boston 30, Mass., U.S.A.. Color Photo Courtesy Union Pacific