The subway gets put under Queen because the one term chief planner and failed mayoral candidate thought that her office at city hall needed not one, not two, not three, but four subway stations within 100 metres of 100 Queen West. Her papers also highlighted the importance of bringing much needed rapid transit to the fast growing tent city at Moss Park. And by going Queen we would not be doing anything that might interfere with her precious streetcar mall on King.
It was put under Queen Street for a multitude of reasons. 1) It was cheaper and easier. 2) They wanted to better serve the northern part of downtown, instead of duplicating the Union Station Rail Corridor. This also meant better serving locations of interest namely ryerson students. Since the line will be travelling between the Financial District and the University, they can better convince both groups to use the DRL rather than going through Bloor-Yonge.
Building on that failure, the father of the failed Scarborough RT had to get his two cents in and demand that we use his capacity challenged remote controlled toy trains and we have to bring it above ground just as the city is finally getting ready to bury his first kid/mistake. There must always be one monument to Schabas' failure in the city at all times. Have fun cramming people on to the full from day 1 sardine cans when the Yonge line has an unexpected emergency shutdown.
Third failure is on the professional fools at MetroLinkZ who fall for this snake oil time after time. (Or are they the pushers?)
Toy trains? Do not compare the Ontario Line with the SRT. The Ontario Line isn't some new fangled technology, its extremely standard metro technology that is being used in Paris, Sydney, and will be used in Montreal and Honolulu; amongst a ton of other cities. It is far more standard than the TR. If we're being objective for a moment, the existing TTC Subway system is more of a snake oil toy train system than this line.
The moment they decided on a major detour and deviation of the route away from Queen is when it should have triggered a full holistic review of the entire thing. Hell it should have happened when the planning dummies had second thoughts and pulled the subway down to East Harbour. Both bureaucracies failed.
The moment they decided to tunnel the DRL directly underneath a Rail Corridor they should've triggered a full holistic review of the entire thing, which they did and the result is the Ontario Line, a far more reasonable use of money for a service that will be just as good if not better than the original DRL plan in terms of alignment (no more going down 4 storeys just to get to the station platform).
The amount of bending over that morons on every level do just to recycle and reuse the stupid tiny streetcar station under Queen station is baffling. A tiny piece of infrastructure from the 1950s is dictating what to do on a $10 billion project. God damn ridiculous.
Who is doing this? Reusing the stupid tiny streetcar stations (and by reusing what they actually mean is the section will be reconfigured to a new concourse level, so nothing is actually being "reused") is more of a "haha check out what we're doing with this cute piece of Toronto History" rather than actual policy that politicians are bending over for. Do you seriously think someone at the highest level is going "We have this tiny streetcar station under Queen, we must do everything we can in order to reuse this segment for our station"? Of course not.
Then instead of listening to the career RT shill they need to be looking at the future of this should-be subway and the problems of having trains that will be maxed out on day 1 and incompatible with everything else on the subway system. NO, removing the few remaining seats from the trains is not a solution just because you decided to create the problem to begin with by listening to a senile old consultant and taking his word as gospel.
The line should be a full subway and should be buried under King but because of these idiots and bozos, it zig zags across the downtown and it will royally mess up both Queen Street and King Street for half a decade anyway and what we will get stuck with still won't be adequate for the present let alone the future.
This is a subway, full stop. This isn't light rail, this isn't light metro, this is a metro/subway. This is standard Metro technology that will have more capacity on opening day than Line 1 has today. Sure there could be an argument for wanting to make this line compatible with the rest of our network, but that doesn't mean this is some cheap toy train. This is as Subway as you can possibly get. As for why its under Queen Street, I already explained why.