You are soup

Passenger and freight trains both came to my city at one point. But then one day I moved the track (connecting the region to my city) a little bit, and suddenly no train was coming through anymore. They won't even go through the track that's in the region (the one you can't destroy). I've tried putting stations along the region track, but still, nothing. I even have another city right next to mine that has trains coming through normally. Does anyone know why this is happening, or how I could fix this?