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Really interesting thread! <br /> <br />25 tons/hour uphill is a number I recall reading. Speeds varied quite a bit in videos I have of operation on the hill. Manifest trains ran quite a bit faster, drags as slow as 15 mph. Double-heading was also common, sometimes with Gas Turbines in later years. <br /> <br />I recently read about some tests NYC did on 2 Niagra's, one with 75" drivers, the other with 79". As expected the smaller drivers moved the peak HP to lower speeds, however the larger drivered loco pullled everything NYC wanted it to and did so on less coal and water. Some have suggested that super-steam locos should have been built with smaller drivers, but I wonder what happens to the Big Boy's steam, water, and fuel requirements if you redid the calculations with 60" drivers instead of 68".
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