I did say you can't have an HSR car train. It simply isn't possible: it would take far too much time to load and unload cars. Also, the weight of the cars is

I did say you can't have an HSR car train. It simply isn't possible: it would take far too much time to load and unload cars. Also, the weight of the cars is probably too much for HSR tracks. There's a reason HSR can't share rails with freight trains.