Please add the Guangzhou-Shenzhen_Hong Kong Express Rail link (Guangshengang XRL; Chinese 廣深港高鐵/广深港高铁） with route listed in the picture; this high speed railway have a length of 142 km in total, with a double-track system. Others can refer to the DLCs of Chinese High speed Railway, some little notes of the speed limit are being listed below: Speed Limit: Between Guangzhounan（廣州南站）and Shenzhenbei（深圳北站）station: Operational Speed: 310 km/h (192.63 mph) ATP speed Limit: 310 km/h (192.63 mph) Operational Speed in Shiziyang Tunnel: 250 km/hOperational Speed Between Shenzhenbei（深圳北站） and Hong Kong West Kowloon Station（香港西九龍站）station: 200 km/h (124.27 mph)Developers should also refer to this linked page from wikipedia (very reliable) and the picture below when you design the map Check this video (right side) and this video (left side; time-lasped) from Bilibili (from Mainland China) to get the actual view for the railway en route. If you need any more information, please leave your message down below, I will try my best to answer all of your questions. All chinese trains started with CR or CRH can ride on it. A new train should be also created which i will add a post later on.
This link below refers to the train specifically for this map https://forums.dovetailgames.com/threads/vibrant-express-mtr-crh380a-mtr380a.77483/
Let me guess you want the Pearl River Delta Region to be in the game this is an easy job for Union Workshop. For the conventional KCR British and Chinese sections HXD1D HXD1 HXD2s are prohibited past Shenzhen/Lo Wu therefore Hong Kong bound trains must be a SS8 DF11 DF4 locos since they have the AWS TPWS DSD for KCR East Rail.
