20-30148-1 UNION PACIFIC BIG BOY SEMIQUINCENTENNIAL WITH OIL TENDER #250-O QuickBooks therefore the Model 22 (A6M3)

therefore the Model 22 (A6M3) was rushed into development in order to correct the Model 32's shortcomings

This Rapido U25B locomotive has features that have never been offered in any current U25B on the market

the locomotive still represented the latest and potential future in steam power

safety sign decals

20-30148-1 UNION PACIFIC BIG BOY SEMIQUINCENTENNIAL WITH OIL TENDER #250-O QuickBooks therefore the Model 22 (A6M3)Just months before Pearl Harbor, the American Locomotive Company delivered the first Big Boy to the Union Pacific Railroad. The UP's Department of Research and Mechanical Standards had designed the locomotive for a specific task: to pull a 3600 ton train unassisted over the Wasatch Mountains in Utah. While the Big Boy is often cited as the biggest steam locomotive ever built, in fact it is not. The Norfolk & Western's Y6 and A, the Duluth Missabe &