So inspired by the RM Transit London video and Rennes generally I played around with what a London light metro might look like, and I think it's actually not bad... and might actually be more of a natural fit as a network backbone than the light rail version that was really going to be very streetcar like. It also wouldn't invalidate much if any of the BRT work if the surface system moves to a feed grid structure.
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Off the top of my head the big issues that come to mind
- the Richmond Row tunnel might really have to go all the way downtown politically
- Western is going to scream and yell for the same asinine reasons they killed LRT and BRT direct to campus... they should be ignored
- there are still some elevated pieces through basically residential are that would probably wreck any economic case if they had to be tunneled
- the airport extension is probably a bridge too far, but the OMSF seems likely to end up out that way anyway, so I'm inclined not to actually map stages on this... BUT, terminating at Fanshawe and having an unbroken through quasi BRT on Oxford would work pretty well in general and be well more than the airport actually needs (on second thought, I'd terminate Oxford BRT at the eastern end of a truncated metro and serve the airport with a Dundas BRT that turns north to the Metro after Argyle Mall and hits the eastern metro terminal to get a direct Downtown - Airport service).
- I'm sorely tempted to delete the station in Gibbons Park, but the presence of a pedestrian bridge and the politics of running the line above grade through a park that had me put it there in the first place make it seem worth... at least seriously considering
- it IS a longer line than the OL, but is very much a small project in comparison to the likes of RER... and has a total system length very similar to Rennes, albeit in a single line
If you play around with the layers I don't show above on Google you'll also find that I've played around with the idea of tram-trains (or really train-trams) down to St Thomas but diverting onto Wellington. It's not a bad fit at all, but the inability to serve Amazon does makes me think that a bus is probably still more suitable for St Thomas until it has actual capacity or traffic issues... and at that point the tram portion starts to create more pain for St Thomas passengers. My actual inclination is real BRT (as opposed to lite on other corridors) on Wellington, with design that doesn't exclude adding light rail with minimal modification. It wouldn't be a terrible idea to reserve space for an elevated guideway on Wellington, but my gut feeling is that even if the core line could be justified it's anchoring both ends on the schools that makes it work, and that a south branch, let alone a western one, would be
much weaker.