The Rhine Valley Railway between Karlsruhe Straburg and Offenburg would be the perfect complement to the TSW2. Here you could use the 185 in freight transport as well as the 146 in local transport and the ICE 3 and TGV in long-distance transport. As a special, you could use the 612 as an SWEG vehicle, actually drive there the RS1 and the whales of the SNCF but why not use the 612?
SNCF Whales are X73900 in Germany Deutsche Bahn it's DB 641 Overnight Trains are pulled by DB BR101 Karlsruhe Offenburg RRO or Riesa-Dresden and ÖBB routes are required to operate the Nightjet Strasbourg Karlsruhe. Locomotives add in BB37000 high speed trains TGV Euroduplex DB 407 406MF
