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<p>[quote user="selector"]How can it be irrelevant when it is so highly contributory to the over tractive effort?  And how do you account for the disparity in absolute performance characteristics at any given speed, except for where they cross?  One's a horse and the other's a mule.  Both good at what they do.  But the steam engine, even now, gets the hearty nod because it is so cheap to run by comparison.  One crew riding 6000 hp can do what two or three MU'd units do now with one crew.  Cleaner, cheaper to run, even though the crewing is identical.[/quote]</p><p>I think the relevance of weight on drivers in this thread depends on its relevance to what we are discussing at any particular point.  Certainly it is relevant to locomotive performance in general.  So is the number of drivers, maximum horsepower available, and transmission ability to vary torque versus RPM.  However, in these last couple pages, I thought we were comparing how steam compares to diesel in terms of developing horsepower at various speeds.  I don't see what the weight on drivers has to do with that. </p>
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