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BTW: I have heard that a Big Boy steam locomotive was rated at 6000 horsepower - the same as the current SD90. I don't know how the two compare in terms of tractive effort. Electric locomotives can confuse things. The GG-1 could generate up to 8,000 HP "running simple" (less than 10 MPH) but 4,800 "continuous" at higher speeds. The SD50 is 3600 HP and (I hear) 100,000 pounds of tractive effort. SD60 generated 3800 HP and 133,000 tractive effort. How is it that tractive effort increases at a faster rate than horsepower? To what extent do different truck designs (such as radial or high adhesion) affect tractive effort?
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