I've been replacing the long conveyor belts that used to transport materials to my base with train tracks and trains. I did so to 3 such long routes, and now these are entirely train based. I sort of expected this to have a positive (or neutral) effect on the games performance.
Alas, I've been getting lower and lower FPS through each game. Either trains are hitting my FPS hard, or there was some other recent FPS change that's causing a significant FPS drop.
PS. Quick specs, for reference:
32GB RAM (yes, that's a lot - used for work or an nVidia Shadowplay RAM-drive)