As Union workshops has been doing Chinese high speed rail for TS Classic. Maybe you can consider joining up to make the first high speed Chinese map from Guangzhou East to Hong Kong West Kowloon. This will just be a dedicated high speed map. With different stopping patterns giving a high variety. Making TSW have its first Chinese map and another high speed map. With easily accessible timetables at https://www.highspeed.mtr.com.hk/en/ticket/timetable.html
This brings TSC Union Workshop CRH380D CRH400AF CRH5 CRH1E Sleeper train into the game. Excellent plan overall and remember to play Xiamen Hong Kong trains up to Shenzhen North