The challenge I have is trying to work out what are suitable values for power (prop. 0B) and max speed (prop. 09). As far as I can tell, there's no direct correlation between TE and power, and I'm stumped if I can find enough information to derive one from the other. Top speed is even more of a mystery.
You could theoretically calculate power and speed for steam locomotives (see attachment).
However, to do so you´d need a lot of technical details (mostly unknown for a specific design), and the results won´t give you a good idea how a certain locomotive would behave under real conditions.
Best thing is to find real values for a given locomotive model in railway books.
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