Considering this route would A. Be unendingly long and would definitely be a huge buggy mess and B. The amount of scenery in Kent and northern france on an unreal game even the best pcs would set alight. I personally do NOT see the eurostar ever coming to tsw2.
It has to be broken down into segments SEHS London to Ashford International via Ebbsfleet. International Segment HS1 Channel Tunnel LGV Nord Ashford Folkstone Calais Lille Europe Final section is LGV Nord Lille Europe to Paris Gare Du Nord. LGV Nord has Thalys PBKA and remember to use the Metalized Carbon Pantograph on SKA HRR 15kv 16.7hz AC
The scenery is loaded and unloaded in map tiles. The length of a route with regards to scenery has very little impact on how much strain it puts on a PC The density of assets in London and Paris may cause some load, but the remainder of the route is towns or countryside so unless DTG do that wavy grass thing again... Shouldn't be an issue. The issue with long routes is the development time as the laying of track, signalling and creating of timetable takes a fair amount of time, and a longer route with more interactions takes much longer to create and test
