Denver Rails -The Railroads of Denver and the West
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UNION PACIFIC RAILROAD MUSEUM IN COUNCIL BLUFFS, IA
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. on 07/18/11)
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