I would Like to see the Harzer Schmalspurbahnen (HSB) https://de.wikipedia.org/wiki/Harzer_Schmalspurbahnen in TSW. It‘s a 140,4km (87,2 miles) long narrow gauge route in the Harz. Baureihe 99.23-24 https://de.wikipedia.org/wiki/DR-Baureihe_99.23–24 Baureihe 199.8 https://de.wikipedia.org/wiki/DR-Baureihe_V_100#199.8 187 016-019 https://de.wikipedia.org/wiki/HSB_187_016_bis_019
Future Loco DLC for this route could be Baureihe 99.590 https://de.wikipedia.org/wiki/NWE_Nr._11_bis_22 And the 99 6001 https://de.wikipedia.org/wiki/NWE_Nr._21
First class suggestion. Of course it would require a recommitment to steam traction from DTG which seems unlikely at present. Yes it could be done with diesel traction but part of the appeal is those lovely brutish tank locos.