I was doing an explore route on the NEC, and went all the way from philly to washington ( i had to throw a few switches along the way) with the BNSF C44-9W, and 2 SD40-2's, anyways, i was running around my train in Washington so i could go back up the line, but as soon as i coupled, the program ended. Are you not supposed to run up and down the NEC? i didn't derail either.