Oddly, that may have something to do with the provincial subway-takeover plans.
Yeah, it's just a little too 'coincidental' that their 'views' would be changing with the changing landscape. "Oh, we were wrong then, but we're right now". Their views are just as suspect now as they were then.
But beyond niggling over the latest 'view'...I sense this being a deflection for something much bigger coming. A "one size will fit all, take it or leave it" plan. And no credit to the present jokers, as opposed to the previous jesters, a much more common-sense plan called "None of the Above" will come out of it.
And that's RER to do it all. No more subways per-se, but some tunnel sections of RER single level EMUs. Crosslinx has given them practical experience of how to bore tunnels for LRT, it will be easier to bore them for OLE EMUs (overhead catenary) and connect them to extant and new GO lines.
Uploading the subway offers them a stark choice: Continue doing it the slow, heavy, expensive way with a forced transfer to continue out to the exurbs, or do it the modern way, the choice many other cities have made: Regional into tunnel where necessary. Uploaded subway will suddenly have to directly compete with more modern and affordable methods, let alone faster, more comfortable and easier to maintain.
Bit of a no-brainer, but alas...Toronto's not had a good history on adapting to successful change. In defence of Toronto, the SRT, which was a leap at modernization, was thrust upon us by the Province as linear propulsion, and of the attractive kind, not repulsive. Krausse-Maffei dumped it on Toronto when they realized that attractive propulsion was doomed to fail in so many ways. They had the vision of mag-lev, which is repulsive traction, and self limiting in distance, and able to 'float' the vehicle on the forces, not rigid distance held in place by wheels that was doomed to fail whenever it snowed, or accumulated too much jetsam.
"EMU" could still be 'metro type vehicles' like SRT, but larger, and of course, orthodox motor traction. This is the largest selling vehicle type/system *by far* right now around the world. For good reason. Almost all manufacturers sell a model line with three (or more) widths and lengths available off the shelf for different sized systems and needs, and in third rail or catenary, either the same as LRT voltage, or up to 25kVAC, which is the current int'l standard for heavy rail propulsion, and what Metrolinx have chosen for GO. For good reason. It's much cheaper and easier to distribute compared to third rail, and the available performance from motors much higher. And it's far more immune to ice, snow and cold weather than third rail.
Crossrail in London is done this way, in tunnels of a smaller bore than the Eglinton Crosslinx, and using mainline trains running out on the Network Rail system to exurbs in other counties. Crossrail is having some last minute funding glitches, but the physical model remains the example many cities are now considering the new standard. Some Japanese cities have been doing it for generations, this isn't rocket science. And at least a few persons at Metrolinx must realize this.
Here's the example of the "Northern City Line" 'tube'...bored to mainline size (same as the TTC subway in bored tunnel diameter) and on and off operated by both mainline and London Underground at different times, always using mainline stock from when it was first built. Yet another example of the limitation of TTC track gauge to disallow such interline operation onto mainline. This line has also been operated with standard tube trains.
See:
https://www.citymetric.com/transpor...city-line-history-moorgate-finsbury-park-4277
The modern replacement trains: (These operate on both third rail at 750VDC and catenary on the mainline at 25kVAC)