Thank you! No i do not intend to add features to turn off train derailment, the in game trains are very unrealistic in that aspect. I am trying to make these trains as realistic as possible, and real trains will derail if the track is not aligned properly, or you take a corner too fast.
That being said, I do think they derail a bit too easily at the moment. So I am working on an update to increase the stability and reduce derailments. Hope to get the update out this weekend!