I have to thank you for this. I have been pulling my hair out trying to figure out why I was having FPS drops, video lag, etc. and as soon as I stopped the trains from running by deleting the time tables - voila! I seem to be fine again.
Correction: I still have some lagging moments when I turn around it seems to try to load elements for the scenery, etc. I'm running an AMD Radeon RX 570 8GB and the game is on an NVMe drive. Would love to run this game in CrossFire since I have two of them but this game doesn't support it. Will try to lower video settings and see if that helps otherwise, not sure what to do now.