Reading a bunch of these posts, I've decided to modify my alignment preference slightly:
Parkside-Rail-King-Wellington-Front-Rail-Pape
Route Justification
The western alignment past King has the advantage of being built at relatively low cost in comparison to the rest of the line, being sandwiched between King/The Queensway and the Rail corridor.
Another thing that is unique about my alignment is the placement of two stations within the YUS loop; a western Station at York which would handle most transfers to Union Train Station and the Spadina Line and an Eastern Station between Bay and Yonge which would handle more pssengers in the financial District and transfers to the Yonge Line.
Having the alignment on Wellington would also encourage more people to walk to Union instead of taking the YUS for one stop.
The Western alignment is pretty straightforward for a Wellington alignment, and I don't see much contention with it.
I left provisions for two possible stations: one at Howard Park and one at the Don River. I can't see the land around the streetcar loop intensifying much, or for this to be a major transfer point to the streetcar until the DRL is extended northward.
There is also nothing currently around Don Lands for people to go to, however, dense development could easily be built around this station. I could also see it as a transfer point for the Richmond Hill GO line.
Streetcar Changes
Some King streetcars could be moved to the Queen line, which could use higher frequency service. It is my hope that at this point, the Queen streetcar would receive higher-order service with limited left turns, very high signal priority, and a dedicated lane during rush hours. King would then become a more major East-West auto conduit in the west end.
I have also proposed new streetcars on Dufferin, Parliament, and in the Port Lands
During construction, the King Streetcar would need to be rerouted on Shaw and Queen Streets to allow for DRL construction
Construction
This is how the line would likely be constructed with screenlines across the route
--Keele--
Open Pit
--Wilson Park Road--
Shallow Cut and Cover
--Clarence Square-- (TBM Starting Shaft)
Twin-Bored Tunnel
--Sherbourne Street--
Shallow Cut and Cover
--Cherry Street--
Underground-Elevated Transition
--Don River--
Bridge
--[DVP]--
Rail Embankment/Elevated
--Carlaw and Gerrard--
Elevated-Underground Transition (Demolition and Reconstruction of Riverdale Shopping Centre)
--Pape--
Shallow Cut and Cover
--Danforth--
Tunnel Boring Machines would be used to construct the tunnel underneath the existing path system, the rail gauge of the TBM will match the gauge of the constructed line to simplify extraction. If standard gauge is chosen, both machines could be transported to the starting location by a temporary rail spur built off the Kingston Subdivision near the studio district. The TBM could then be used for other subway projects in the GTA, (ex, Eglinton LRT)
I hope you guys like the proposal!