The train is more of a CPU bottleneck than GPU. Tried checking your CPU temps after crash? Could be throttling and throwing the game out of whack. Had similar problems even when temps were below 60C in eurika a couple of weeks ago, and only there. Went to check inside of computer and one of the plastic retention things they use on the intel heatsinks had actually broke causing one corner of the heatsink to slightly lift. Temps were fine if what was reported was accurate, so I had no idea. Replacing the pen with a nut and bolt solved it for me permenantly.