Hey waterloowarrior, if you could move this discussion over to a transit thread that would be great
I chose Tremblay for the short turn because the rail yard is there. It seems convenient for at least one line to end at the rail yard, it should make it easier to swap trains in and out of service. Agree that a higher ridership location like St. Laurent or Blair would be better, though.
Some more thoughts on my Phase 3 plan...
As part of my idea, I'd like to add that I propose some sort of method for buses to access Corkstown Station from the 417; that way, it can serve as a major bus hub allowing for connections between Transitway buses to Kanata Centre, local buses in Kanata (I'd like for all local routes in Kanata to terminate at Corkstown), and the two rail lines.
As for why I chose the Barrhaven line to go Bayview and the Kanata-Nepean one to Hurdman. I don't want 3 lines going to Bayview as that could create scheduling issues along the route and also overload Bayview Station at peak periods. I also don't want 2 lines going to Hurdman/Tremblay as that would overload the VIA tracks. I figure the Barrhaven line will probably be used mostly for core-area bound commutes (to downtown, Tunneys, U of O, etc.) and Bayview is a better transfer point for those. Whereas the Kanata line, while still seeing downtown commuters, will probably see fewer of those and more crosstown & reverse commute trips as there's the connection at Corkstown that Kanatans will probably use for downtown travel, plus it serves lots of employment areas along its route (Colonnade, Kanata North, Merivale, etc.)