In this suggestion, I am suggesting the line from Köln Hbf to Siegen Hbf, it travels via Köln Messe/Deutz, Troisdorf, Seigburg/Bonn and Au (Sieg). The line will also include the Köln/Bonn Airport Loop too. Rolling stock: DB BR 111 + high-floor dostos + control car. BR 193 Vectron Layers / Substitutions BR 423-S-Bahn (Requires New Journeys Expansion) BR 403 - ICE services between Köln Hbf/Messe and Seigburg/Bonn. (Requires Kassel Wurzburg or Munich Augsburg) BR 406 - ICE International for Brussels-Frankfurt between Köln Hbf and Siegburg/Bonn. (Requires Köln Aachen) DB BR 146 as a substitute for the BR 111 services. 7.66 Control Car as a substitute for the older Dosto cab car. BR 185.2/5 and BR 187 as a substitute for the included freight services.
Good idea and if you want to make the route better you might as well merge it with Bahnstrecke Hagen Finnentrop Siegen Ruhr Sieg Nord Schnellfahrstrecke Köln Aachen and the proposed Rhein Wupperbahn Köln Hbf Wuppertal Steinbeck. For the freight services you need to end them at Köln Gremberg & Kreuztal Gbf source is German Wikipedia. Both yards are the German version of Cajon Pass Barstow due to the Hump. The way it's going to work in game is that you simply switch the locomotives from DB Baureihe 185.2 187 using 363 204 & G6 DB Baureihe 650 Vossloh then send the freight cars over the Hump inside the yard. For the price of a normal route your route combined with Schnellfahrstrecke Köln Aachen & Wuppertal Steinbeck Köln Hbf if made as Nahverkehr Köln bundle
Quite a short route for a commuter route but nevertheless amazing suggestion and it could merge into SKA
