You already discussed the reason why there is no Italian, Spanish, Danish, etc... route is because to cover the costs of creating a completely new signalling, safety systems and the licensing cost you need to be sure to sell at least 2, even better 3 different Route Add-Ons, which I completely undestand and I agree it's the right way going forward, so for now we should get some more French content (hopefully some traditional lines as well). First, Japan is already a "DTG Country" there are already Japanese DLCs for RW, so I ASSUME you already sorted out licensing from some japanes railway companies. The reason I think Shinkansen is the better option for High-Speed is because of the high density of stops and a more fun Start-Stop type of services. For example in the first 95km of the Tokaido Shinkansen there are 5 stations, so for the same route lenght of the Marseille-Avignon we are getting A LOT more content and possible services, keeping in mind there are some slower and faster services. We might see some overtakes (which I think it's big missed opportunity in the Koln-Aachen), and I'm just picking the first section of the first route I found, I believe the DTG team is able to find a more suitable and better piece of track. And I think this peculiarity really sets apart the Shinkansen from any EU HSR, Don't get me wrong the TGV is very iconic and has its place but the Marseille-Avignon is just depart from point A, set cruise control, arrive at point B after 30 minutes, which I fear will get really old really quickly. Also Japan allows a good degree of variety, I still remember the Hisatsu line and the Tokio-Hakone being two of my favourite stock MSTS routes and even if set in the same country, they can't get much more different from each other. Also I think learning a potentially completely new signalling and safety systems would be a pretty neat challenge for who already ""mastered"" the german system... but I guess TVM and KVB are enough for the near future. All European systems are very same-y and going towards standardisation anyway.