I see your latest version registered is TS2009. Is that indeed the most recent version of the game you own?
If that is indeed the case, I can not help you.
If you secretly own TS12, consider these two: Multi Level Layout 84/84 - This has a 8km / 5 mile loop. Multi Level Layout Huttel - This has a 14.4km / 9 mile base loop, but a maximum loop of 21.5km / 13.3 mile.
I just added a loop at the ends of an existing route and saved it with a new name. I went through and set the switches for running before I saved it. Trains runs forever now without intervention.