Factorio Forums

Game tells me a train belongs to an invalid force index= 17 upon trying to continue my world from the home screen. Seems to be a bit flip issue and I've heard that it's very solvable. I've picked through my world save files and couldn't make heads or tails of any of them. I've come across posts where someone fixes them for the person having the issue which would be nice but I'd much rather know how to fix the issue myself or be pointed towards resources to do so. Anyone got any?
Thanks!

Is it cheating if I debug factorio and make it pick a force that exists.

Thank you so much. This makes me happy to have this world save again.