Click on the image or link to download a PDF of this drawing of the Union Pacific Big Boy
In 1941 the Union Pacific RR took delivery of its first 4-8-8-4 single-expansion articulated steam locomotives. Aptly named “Big Boy,” these 7,000 hp, 386-ton locomotives were the heaviest and among the most powerful simple articulateds ever built. Click on the link below to download this vintage prototype drawing from the March 1954 Model Railroader. For more vintage articles, be sure to check out the Model Railroader Digital Archive.
