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I have been wondering why train simulators(and trains themself) have a kW specification, AND a maximum force indication.

If I would calculate the speed of a train using some formula, then where is the power value used for?

Does it have something to do?

Or is only the maximum force used for speed calculations?

And I also have another question, I understand trains have a tractive effort curve, where the amount of force at what speed is specified:

Is it possible to calculate such a curve, how?

I am trying to understand train physics, so I hope someone can help me,

Thank you very much!