Comment by lmm

> Is it written in stone that a train must fit entirely into a station so that all doors face the platform and can be open simultaneously?

When you're building high capacity transit for dense cities, yes. You could stop the train twice in the same station, sure, but at that point you have to stop for twice as long (probably a little longer than that as your riders will get confused), so your train takes ~twice as long to get anywhere and can therefore carry ~half as many people.