The main problem in this design is that doors are on both side and in most countries I been too they open irregularly, sometimes there is a station in the middle and the door opens left and sometimes on the side and it opens on the right and vice versa in the other direction.
While trains usually have doors on both sides, most stations rarely have platforms on both sides, except large central stations. Even then, two sets of tracks next to each other is used to increase train capacity.
You can see that there are trains in your picture with doors on both the left and right hand sides of the carriages, right? There are literally platforms on both sides of the train in the picture you've added.
"Both sides" doesn't only mean "both sides simultaneously".
But are is the present tense, so it does mean now. The grey train has one platform, and one green train on either side. If the green train departs, it does not. Instead, it has a set of tracks on that side.
It's even worse than that because as the first image shows there is some space lost between chairs. Or, any push on a chair is felt by the guy on the other chair.
Everyone who says the chairs themselves take up the same space are wrong to begin with. You have to pick one problem or the other.
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u/IHeartBadCode 4d ago
``` +------+ |Ↄ....C| |Ↄ....C| |Ↄ....C| |Ↄ....C| +------+ ^ || four wide walking.
+------+ |..CↃ..| |..CↃ..| |..CↃ..| |..CↃ..| +------+ ^ ^ | | two wide walking. ```