[DocTomoe]

Generally, when you go the high-speed route, you have lines that are a lot longer than slower, more local lines. You do not want stations along the way to be terminus-style stations, where you'd

1. have to switch out the driver position from one end of the train to another end to just leave the station again and

2. have a series of track switches which may malfunction (which ironically is a challenge even for highly industrialised countries like Germany), and it

3. means more and slower track to be maintained.

If you set up a bullet train program, you want speed, and these problems kill the speed advantage. The solution is to build a new station in which the train can just pass through.