In this suggestion, I will be suggestion the Köln - Frankfurt Highspeed line as Schnellfahrstrecke Köln-Frankfurt running from Köln Hbf to Frankfurt Hbf via Köln Deutz Messe/Deutz Bf, Siegburg/Bonn and Frankfurt Flughafen. Total distance is 177km or 110 miles but it could be longer if potentially merged with Köln-Aachen. Rolling stock: BR 406 ICE 3 (Upgraded with TVM Displays and different pantograph settings for 25kv ac and Belgian DC lines). Layers/AI/Substitution AI only will mainly be at Frankfurt Hbf and Köln Hbf with some drivable S-Bahn and RE9 layers from Köln-Aachen and New Journeys Expansion including AI TGV Layers at Frankfurt. The BR 403 from HMA and KWZ will also substitute for domestic ICE services. It will be the first German route in TSW3 to have a speed of 300kph or 186 mph.