I just spent a bit of time looking at either side of Queen-Broadview.
- To my mind, crossing the GO-LSE alignment is madness when origin and terminus are north/west of it, plus the west-east/north-south transition needs a certain curve radius, preferably not minimum (approach to Union?) so as to keep track and wheelset wear in check.
- Digging up Queen for a station east of Broadview severs direct downtown access from Russell and Leslie yards. Let's assume the back route through Commissioners isn't done and widening and railing Leslie to Gerrard isn't either.
- Even if you do dig up Queen, is there room for a station box by the time the tunnel straightens up before impinging on the diamond at Broadview? Doubt it.
- Look at how long fixing the footings at the King side of the streetcar bridge over the Don took. Wanna mess with that again?
All of that says to me that the Queen/Broadview station should not be on Queen. Warning - major wrecking ball crayoning ahead. Apologies to all property owners in the vicinity.
Basically, the streetscape along Clark and Thompson is gonna need major revisions to become akin to Strathmore north of Danforth. The tunnel would curve off, under Degrassi to straight up under (or possibly south of) Clark with the station box being constructed under the Thompson Street Parkette, the houses west of it and the parking lot and 4 storey redbrick building west of that, maybe a slice of the street itself too. Major property taking all the way along, but it does not sever Queen at all and minimises disruption to 504. At least the rebuilt Jillys can take the construction pounding right?
The TTC's decision not to go ahead with a loop at the TPA lot becomes an advantage at this point since that is available as a staging area assuming the station box won't need to extend into it anyway to give a longer exit tunnel to the Don crossing - would immersed tube work I wonder to allow the station be less deep?
The tunnel would run north of the bridge, under the Richmond Hill line, but then dodge south under the Toronto Humane Society but I have doubts it can successfully avoid all of the Queen/King junction without impacting the rather nice 550 Queen St East at the NW corner of Queen and River. The tunneling would be under Queen from there on, with the next station at Parliament.
Of course, if they had gotten on with DRL years ago, Leslieville property acquisition would have been a lot cheaper!