Aren't the SE travel time savings more from having a far more direct route instead of Macleod or 17 Ave? A BRT scenario could also offer huge efficiencies in directly reaching the communities in the deep south instead of trying to shuttle them to Shepherd.
BRT should still have dedicated ROW for the entire route (or at least as much as is practicable) with the long-term ability to change to rail. I'm just really skeptical that the ridership will justify the additional CAPEX and OPEX for rail anytime soon. Look at how big they drew the catchment area for the SE that ignores some significant barriers like the canal, to boost numbers with a lot of industrial workplaces that may not have hours conducive to transit and typically don't have parking/traffic issues anyways:
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I just want a great transit system for this city and worry that this could actually be crippling.