The levels were a bit rushed, this was created for the Godot Wild Jam #59 in 9 days, and the mechanic and gameplay took longer than expected, so putting the levels together was left to the last couple of hours before the deadline, so they aren't great. Changing the track while the train is running shouldn't be allowed, and I've disabled that now, along with a few other changes, just need to sort out some problems and I'll do a new release.