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DE Loc BR 64

I was more wondering how you calculated or estimated the horsepower in the absence of official information, I am quite familiar with the options that can be specified in a mod, and would have good access to information on the locomotives. The force pulled by a locomotive often stays fairly constant, or at least much higher than a diesel or electric would, while it is the Power than varies. This is quite in opposition to the way NimbyRails simulates trains' performance at the moment.
Thanks for your time in responding to me, I'll use those resources and your steam examples to inform how I simulate mine.

For the power, multiply the given horsepower by 0.745. It's not perfect but it comes close I guess.
For tractive effort you can look up the wiki page for 'Tractive Effort'. Although it gives a formula that requires a lot of factors that may not be known.
I also use this calculator:
https://calculator.academy/tractive-force-calculator/#f1p1
Put in the weight in kg, give it a factor of 0.3 for steam locs, and multiply the whole by the percentage of the weight you think is loaded on the powered axles.
For this loc in particular I have been lucky as all values were given (700kW and 120kN are listed directly on wiki)

How did you calculate or simulate Power and Tractive Effort for this locomotive? I'm wanting to simulate some locomotives of my own, but I'm not sure how to set these values as the game's systems are very much geared towards diesel and electric traction.