I actually think this is a huge challenge and not going to be made any better with more frequent service and shorter dwell times. Everytime I use one of the stairwells at the new York concourse, I think to myself "good thing this is only 1 way traffic".....if we get to the point where trains are dwelling shorter times and we are using the platforms more then those stairwells are going to be facing two way traffic a lot more frequently than they are today and they simply won't be able to handle it.....this may be alleviated by the re-opening of Bay....but, still, the idea is to drive more passengers through so maybe that won't make as much a difference as first thought would indicate.
More tracks (than already planned) is not necessarily needed. Paris RER pulls off SmartTrack+RER with only the equivalent of 5-tracks to Scarborough and 2-tracks to Stoufville.I wish Metrolinx would accept that they need to do more with RER for Toronto. 4 tph does nothing for the 416. And Smart Track needs more track space.
This made me laugh. I've been wondering what RER stood for, so I click on this link, titled What is RER, and what follows is essentially a closed group of the acronym-wise, where no one tells us what RER is. Thankfully there's google and wiki https://en.wikipedia.org/wiki/RERbut it seems the idea of RER is a very vague one.
Before this I thought the RER was for electrification of the lines, like we used to have... http://www.trainweb.org/oldtimetrains/TSR/junction.htm