This is my focused look into the (now rejected) Union Loop Extension plan. Was kinda hoping we'd see it costed or analyzed more before its rejection. It was probably unfairly costed too high and deemed too complex. But considering the amount of construction and bottom-up planning for the central waterfront, it could've been done for a lot less and simpler than estimated. And just as the people mover and walkalator returned after rejection, so to could a Loop Extension.
For the eastward extension of Union Loop and new tunnel/platforms it theoretically could be worked into CIBC Square's construction. All the infrastructure would be located below USRC just north of the CIBC site. So in effect it could mined-out laterally via CIBC Square's excavation and active construction site. Any services on USRC wouldn't be disrupted, and access to the current loop could remain for the majority. Probably way too late, but if the City/Metrolinx flexed their muscle I think it could still be accomplished.
All the rest between Union and the eastern portal would be relatively easy, and extremely beneficial to locals and longer-haul riders. I mean, the entire area will be rebuilt from bedrock up, including the streets. While sewers and watermains are being put in, just add in a cut/cover streetcar tunnel.
Long and short: rather than
losing ~500m of key grade-separated infrastructure like some of the QQ-Union plans, we would be
gaining ~700m. This 1.5km subgrade stretch is obviously a lot less than what we're seeing elsewhere like Eglinton, but would probably be adequate for (at least marginally) carrying the demand. Certainly more than any other QQ-Union plan.
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