My favourite part of the Ontario proposal was that VIA didn't seem to be involved in any way. VIA has a large number of limitations (spoken language requirements, union contracts, headquarters in Montreal, ...) that I wouldn't want to apply to an Ontario funded HSR. This is one of those times a 30+ year Design+Build+Operate+Maintain contract is highly applicable.
Allow VIA to sell tickets, the same as they do for GO and UPX. I'm not sure any deeper integration with VIA is necessary or even wanted. Changing trains isn't a big deal. Going from Spain to France (Barcelona to Paris for example) you change trains at Perpignan and have separate tickets for AVE and TGV; it's not a big deal and a good excuse to stretch your legs.
Or it can be like
Eurostar and TGV. They
share tracks in some parts of France. Eurostar goes through multiple countries, while TGV is mostly domestic.
Changing trains also works too, and most HFR trains will likely stop in Toronto, but VIA is a federal company with Canada-breadth operations. This situation VIA is a federal company that has a mandate to provide interprovincial operations. Presented already-built HFR-compatible passengers corridors, there is strong assumed political encouragement to provide service especially where economically feasible (A theoretical Metrolinx HSR corridor might very well be simultaneously compatible with VIA HFR, for example)
So we can't assume zero HFR trains will continue west of Toronto, if economics justify it. It likely won't be every single HFR train going into the Ontario HSR corridor, though.
In such a situation, there's no reason why VIA can't pay an Ontario entity (Metrolinx or another company operating HSR corridor) for slots to run a few HFR trains all the way to London.
In theory, if economically viable, VIA can buy 200-240kph capable trainsets to run on 177kph HFR if it allows them to access the TKL corridor at feasible rates charged by Metrolinx to VIA.
It's just like Acela Express, a 240kph trainset not allowed to go 240kph on more than 90% of the track -- there are city pairs on 240kph Acela Express that has speed limits under VIA HFR 177kph.
It's unlikely Metrolinx will begin 15-minute-or-better headway HSR
all day long, so there's plenty of space to squeeze VIA HFR/HSR trains between Metrolinx-operated HSR trains. France runs TGV with headways as small as 3 minutes!
VIA never said they won't be buying EMUs. If VIA ends up buying EMUs, in many cases it is not a terribly huge cost difference between 180kph-capable and 240kph-capable EMUs, in the light of a total project cost. So why not buy the 240kph, to keep the option of going faster later (e.g. incremental HSR upgrades, or entering the Ontario TKL HSR corridor) -- if by the time they were ready to procure the EMUs, that they saw HSR was approved on TKL already?
The timelines of HFR and HSR may end up overlapping, so if you run 240kph-capable EMUs at 177kph for a few years, that may end up cheaper than a premature fleet replacement. Not necessarily, they would need to do the math, of course. On the other hand, it now becomes politically easier to upgrade sections of track. You're probably running on brand new passenger track built to modern standards of high-frequency rail, not beat-up track, which if properly built, may actually pamper 240kph trains forced to initially go 100-177kph.
You know... the 177kph speed is often only because of grade crossings, a straight newbuild 177kph electrified corridor with compatible catenary (wear, resonances) can easily be built to 240kph compatible spec if you're building the corridor anyway -- if only if it weren't for those danged expensive-to-solve surface crossings. Sections of VIA's corridors are already straight enough for several 240kph sprints. But the megaexpense is the complete grade separation cost. So the amortization may actually end up manageable/comparable/maybe even better depending on what the HFR plan is and which type of trainset is planned... (
As I earlier said, it is possible the math ends up that it takes only a sub-$1bn expense would be almost all it takes to make VIA HFR a more honest high speed train than Acela Express -- a very tiny section of 240kph sprint between Toronto-Ottawa is all you need to advertise "HSR")
It's meaningless to talk of excluding VIA trains on Ontario/Metrolinx/or separately operated HSR corridor, without knowing further details. If VIA chooses to buy EMU trainsets (And they might) capable of slotting between the Metrolinx HSR's, without interfering with HSR, then there's nothing stopping Metrolinx charing VIA for a train slot to London, and nothing stopping VIA from taking advantage of this. Perhaps it could just be a few trains a day going past Toronto.
At such an early stage, I wouldn't assume that
zero VIA HFR trains will head west of Toronto (when the TKL HSR era arrives), without knowing the HSR plans and HFR plans.