I seriously doubt that RER trains in off-peak and counter-peak times will be crush loaded to the extent that short-distance trip takers will somehow be forced into the upper levels. If we had level boarding on 12 cars or even 6 cars instead of 1, there should be enough space for elderly customers, families with kids, and those with mobility concerns. In fact, from what I've seen, a significant amount of dwell time at stations is from operators needing to extend the ramp from the designated accessible car, then to pull it back again. People already start making their way towards the doors as soon as their stop is announced anyways.
getting kinda off-topic to electrification but heres my .02 on level boarding
most of that is true. but as someone who used to ride from whitby pre-covid. those lines for the doors were looong took a full minute to load up sometimes. and just as long to debark
Now basically to fix this you do a couple things.
1. level boarding so people can walk on faster
2. more doors
3. more frequent service.
level boarding is being done, but it only marginally helps, ya the bridge takes awhile for the wheelchairs but not as long as you think
more doors would be nice, but i doubt theyre getting a train with 3 doors per car.
2019 service had trips between 7-8am at 709express, 719express, 739express, 748 all stop, 756express.
most downtown workers who had to be in by 9 took 756, because 739 would be too early (823 vs 845)
The point is, the dwell times arent just instantly solved by level boarding, the doorway is only so wide. Dwell times are just IMO a matter of more frequent service, at least having more than 1 train every 10 minutes.
looking at the business case, i dont think they can actually do faster than that in peak service. 10 minute peak service?
Off-peak service other than events downtown i dont think ever got as high as peak ridership