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Friday, March 5, 2010

Union Pacific Railroad Big Boy Steam Engine Postage Stamp

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From - The Union Pacific Railroad Big Boy was the largest steam locomotive ever built. In total, 25 Big Boys were built By The American Locomotive Company between 1941 and 1944. A Big Boy could generate a maximum of 6,290 drawbar horsepower. The Big Boys were the only locomotives to have the 4-8-8-4 wheel arrangement, combining two sets of eight driving wheels with both a four-wheel leading truck for stability entering curves and a four-wheel trailing truck to support the large firebox. The last run was July 21, 1959.

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