> So now that we have automatic trains with automated gates, they could have different kinds of trains for rush hour. I don't quite see what automation has to

> So now that we have automatic trains with automated gates, they could have different kinds of trains for rush hour. I don't quite see what automation has to do with this, though? Granted, with fully automated operation it's a little easier to shuffle trains around without having to worry about how that impacts the rosters of the humans operating the trains, but the main problem here is that it'd be extremely inefficient to keep a completely duplicate set of trains (and more) around just for rush hour. At most, you could try building the extra trains that only run doing peak hours to a separate design, but that still makes maintenance more complicated and means that only a relatively small fraction of trains (I don't have numbers for Paris at hand, but on the Underground in London it'd be e.g. 20 - 25 % at most) will actually be of the "super high" capacity design. So in my opinion the only really sensible thing if you want to go down that path would be to do what I've seen with some Japanese lines, namely use foldable longitudinal seating that can be remotely locked in the upright position and then unlocked again after the peak. As for > and the train doors could open upwards. So instead of the people having to squish through small openings, they could get on and off through practically the whole length of the train I don't know, that'd seem at least a bit dubious in terms of structural integrity, wouldn't it?