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[quote user="MichaelSol"][quote user="Bucyrus"] 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. [/quote]The horsepower requirements are developed from tractive effort, which is, in fact, directly related to the weight on the drivers. Ultimately, it has everything to do with performing the calculations regarding horsepower, which is why I "marked" the earlier comment that thinks the whole idea of "weight on the drivers" is "just made up" or 'irrelevant". The forumula is: HP=TE*Speed/375  [/quote]I understand what you are saying and how tractive effort relates to horsepower and speed.  But what I have been focusing on is your table about horsepower.  I don't see that the table indicates any relationships about tractive effort even though tractive effort has a relationship to horsepower in locomotive performance.
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