If you assume fair integration (hopefully it'll happen eventually), BRT seems like a much more flexible option for the region:
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Scarborough yards station is just north of the Sheppard McCowan interstection (see image below). It would be large enough for dedicated platforms for VIA HFR, a future GO midtown line, Line 2 extension, and a line 4 extension. You could potentially connect line 2 and line 4 to allow through running,
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The BRT routes through the region allow for easy trips to most key areas or transfer points. All routes would ideally have dedicated lanes and signal priority,
- Viva Red A
- Cornell to Scarbourough Yards station
- Routes via Highway 7 and McCowan
- Viva Red B
- Cornell to UTSC, west on Highway 7
- Routes via Highway 7, McCowan, Finch, Neilson, and Ellesmere
- Steeles BRT A
- Pioneer Village/Highway 407 to Scarborough Yards
- Routes via Steeles and McCowan
- Steeles BRT B
- Pioneer Village/Highway 407 to Cornell
- Routes via Steeles, McCowan, and Cornell
- Malvern Express Bus
- Malvern to STC
- Routes via Neilson and Ellesmere
- Durham Pulse
- Oshawa to Lesmill station (New station on the Richmond Hill line at York Mills)
- Routes via Highway 2, Ellesmere, Parkwoods Village, and York Mills
- Eglinton East LRT
- Uses proposed routing to pan-am, then up Morningside until the rail corridor, uses rail ROW to get to Scarborough Yards