The performance has been "fine" as far as I can tell. We're at 200 downloads as of now and the only things that have been brought up are compatability questions.
The next steps for myself are to now resurrect the Diesel Trains mod (already finished the baseline stability testing) and then create a steam trains mod, that uses coal/wood loaded into a train in combination with water to power trains earlier in the game - for players who might want trains from the get go. These are then going to be rolled into a Progressive Trains mod as dependencies and it should be a nice package for players who remember some of the older locomotive mods :)