Denver Rails -The Railroads of Denver and the West
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Attraction 591 of 1699
UNION PACIFIC RAILROAD MUSEUM / COUNCIL BLUFFS, IA
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The designers determined that to pull a 3600 ton train, a tractive effort of 135,000 lbs would be needed. Assuming a factor of adhesion of 4.0, the weight on drivers would have to be 4.0 * 135,000 = 540,000 lbs. Given an axle loading of 67,500 lbs each, this would require 8 drivers or the 4-8-8-4 design. http://www.steamlocomotive.com/bigboy/
Submitted by Rich A.
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