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?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom. Abstract Rail vehicle resistance is a key factor for train energy, driving and planning issues. Direct use of traditional empirical formulas in this regard has been reported as inaccurate for a long time.
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