I think the Köln to Duisburg route would make an excellent addition to TSW2. Initially I was going to suggest Köln to Düsseldorf but if route/timetable merging were possible then you could get a long run of the RE1 service from Aachen to Bochum, plus it adds extra length to the existing HRR which people are after. It also works very well as a stand-alone route for newcomers or those not interested in the other routes. The route covers a distance of roughly 65km with journey times ranging between 35-50 minutes for ICE/IC/Regional and 50 minutes from Köln to Düsseldorf for the S6 service. Köln to Düsseldorf itself is a very busy route with ICE, IC, RE/RB, S-Bahn and Freight all running on the route. It also makes use of LZB. In terms of rolling stock the majority of regional services which cover Köln to Duisburg are operated by 146&double deck coaching stock. ICE services are operated by a variety of ICE units and IC services are operated by the 101. This route also offers the ability to run Thalys on the whole route (or from Aachen if merged). Just a side note, I'm British and my knowledge of German railways isn't fantastic (TSW was the main thing that got me interested in German railways more) so I've complied as much as I can from some basic research. Feel free to correct me or add anything else interesting which I've not pointed out. Be interesting to hear everyone's thoughts. I commonly play the route in Zusi 3.