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this is my initial reaction as well, however, the question is "rolling friction" and there is a wrinkle here which makes "force equals mass times acceleration" the wrong tool to answer this question. <br />the quoted author, mr. armstrong, is very clear in his intent. he later says, "the formulas usually used for estimating train resistence gives 4.2 pounds per ton for the loaded car, and almost three times as much per ton for the empty." (the railroad. page 20,paragraph#3) <br />this statement seems to be counter intuitive. does any one have a lead on how to explain it? <br />thank you. <br />cbt141
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