My biggest wish is the route Freiburg - Endingen and Freiburg - Breisach. On these routes, the BR 1440 runs every half-hourly to Seebbrugg or Neustadt on the Höllental unnd Dreiseenbahn. By the way also 2 very nice stretches. with the route freiburg - breisach / endingen you could supply the 422 and 146 with dostos as a rolmaterial. freiburg - breisach is called Breisacherbahn and gottenheim endingen kaiserstuhlbahn. I would be super happy about this add on!
i think this is a good idea i my self have been a passenger on the S11 and S10 route because i was on holiday in freiburg i personaly think the part between himmelreich and hinterzarten was the most beautifull part of the route so i would think that if that would be included it will be cool so my idea is to add Breisach - Seebrugg so you get both flat and mountain terain