Half of STCs buses are moving to sheppard. I don't see a problem with terminating Sheppard there, especially if half the bus connections are there. Yes, its an extra transfer for those south of the 401 or those living at STC, but it is still a 2 km trek. It won't be a (comparatively) short subway ride.Every time I see this I get angry. I get angry because this could very well happen. We know the Scarborough Town Centre is the central hub for Scarborough, not withstanding the large mall and development planned, but STC is also home to the largest bus terminal in the TTC network, a GO Bus terminal, an Intercity Terminal, and is also the planned terminus of a BRT service to Durham. So this idea of the Sheppard Subway not going to STC, but instead a kilometre north to Sheppard is insane and is to me indicative of everything wrong with transit planning in Toronto. Is there development potential at Sheppard and McCowan? Yes of course, but development potential should never supersede transit connectivity and ease of use. Am I saying the subway shouldn't go to Sheppard? No, it can go to Miliken park for all I care, but the Sheppard Line must go to STC because that's the logical thing to do, it's were all the buses both local and intercity are, and is and has been since the 80's the core of Scarborough. There is nothing wrong with having the Sheppard Subway veer south towards STC after lets say Kennedy. Not to mention if you are intent on sending the Sheppard Line into Durham (not something I necessarily agree with) than Ellesmere is the better road to follow since you would hit UTSC on the way. East of McCowan there is nothing of note on Sheppard. You can still have the SSE go to Sheppard, but the Sheppard Subway should under no circumstances go anywhere but the Scarborough Town Centre.
You can very easily elevate TRs. It's done at Allen Road, and all over NYC. They're choosing a different rolling stock option for the ontario line because of the decreased turning radii. That's not an issue on Sheppard — it's a straight shot.I'm not opposed to extending Sheppard, it should just be above ground as much as possible. We need to get off the insane treadmill of grossly overpriced tunnels under suburban arterials. And if it means we need to retrofit Line 4 to use lighter trains, so be it. TR are total overkill for a suburban line. We're not going to get the extensive transit in the suburbs people want at $1B per km.
You'll end up spending a billion dollars retrofitting the Sheppard subway, increasing your rolling stock procurement costs, and decreasing your compatibility with the existing subway for nothing.