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[quote user="timz"][quote user="erikem"]By dropping the tonnage by 5%, the UP got 50% more speed and were less likely to stall on the hill. [/quote]If you're talking about the Wahsatch climb, 5% less tonnage would mean something like 5% more speed. It's not clear just what Le Massena was trying to say in that paragraph, but it we can't accuse him of saying 5% less tonnage means 50% more speed.[/quote] let us compare it with those test-data:I made a mistake by writing min. speeds of all runs was 13-mph.Actual  with run no. 4004 it was 15.9mph (the lightest one with 3539tons). The heaviest of this trio was 3883tons with engine 4016. Here the occasionally min. speed was 13mph, regularly 14mph on 1.14% grade (~4300hp). Engine 4004 produced ~14% more speed with ~9% tonnage, Echo to Evanston: Water/Evap. per Coal 4.72%  against  4.15%  of engine 4016.It is a difference, but not as big as the propagated 5% less tons and 50% more speed. Cheerslars
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