It seems that all cargo in the game is weightless, which in my opinion is odd as hell. Moreover, it makes the distinction between freight and passanger locomotives moot.
I know the weight of the carriages have an effect on the train, I have tested that with racing trains with various carriages 🙂 but not really thought to test laden vs unladen…although it wouldn’t be the easiest thing to test and gather usable results..
I would be interested in a reply from the dev’s just because I am curious now you brought it up.
Ill keep an eye out for your mod in the future 🙂