Longer trains means that the trains will spend more times switching at crossover tracks, which means lower train frequency. 40 tph would likely not be achievable with trains of that length, however that would certainly be offset by the increase in vehicle capacity. Just something to keep in mind.Yea, unless you're a midget like me most people will be unable to press up against the door completely to use that edge space (unlike on our current trains where you can become one with the entire door, one of my fav crush hour activities).
However that space can be made up if the carriage design allows for a lot of additional standing room by only allowing longitudinal seating along both sides (like in the photo).
OL trains appear to be shorter than our regular 6-car trains by a whole 38 metres, so to me, train length represents the largest variable that can be used to increase capacity. If OL trains are put together to be around the length of the regular subway trains, they can carry some number between 1000-1200 instead of the supposed 720-850 (in comparison to the rocket's capacity of 1462). Combined with it's proposed max frequency of 40 tph, theoretical throughput still would be less than Line 1 finished with ATC but more than present day Line 1.
ofc i'm just dreaming, i doubt there is a will to rough out 40 metres beyond current underground platforms unless i go there and dig it myself
Before moving to longer trains, I would suggest wider trains. Boring wider tunnels doesn't cost a significant amount of money, compared to building longer station boxes.