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You know I was asking myself this question (not about SD70MACs but about any loco) just a few days ago and was going to post about it and forgot to post it. The question about how much a car should weigh is a very good question. Is there a formula to use to determine how many cars a certain engine CAN pull? Or it is simply a trial and error deal? Yes, I do know that grades do make a difference but how do grades figure into the formula if there is a formula? Since I have HO, and many forum member also model HO, does the formula change for other scales? Good question and some good comments so far on this one. [:)] Keep up the good work guys and gals. [8D]
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