KW is NOT part of the primary VIA Corridor Route for good reason...……...it's too slow, indirect, and has no connections to other major routes. The idea of HSR to SWO was never planned by VIA or Ottawa but rather on the back of used toilet paper for cheap political points by Wynne.
That's not entirely true...at all. The Kitchener route connects to many other rail lines that, sure, don't connect to downtown Toronto or the southern Ontario railway, but do connect with CP, the CN Markham sub, the GE railway, and reconnect with the CN line back in London.
Basic track rehabilitation would easily remove the slowness of the corridor, but even then, that's not a huge investment. High speed rail as a concept isn't even supposed to connect with other railroads, it's supposed to be its own dedicated line, that's the point of high speed rail. Going VIA Kitchener also opens up the opportunity for faster Chicago service (on a polar map, it is the most direct routing).
In terms of it's indirectness, that is not at all the case. The two routes only differ by about 10 kilometers, and even then, that small of a distance can easily be made up by shortcutting the section between St. Mary's and London.
Some things to consider with the Hamilton routing:
1. it's still running searchlights (I really want to grab one and restore it before they're all gone), so the entire signaling system west of Hamilton needs to be redone, and it's more significant, so it'll be fairly expensive.
2. it passes through the niagara escarpment. This makes any sort of additional construction, maintenance, and expansion extremely difficult and geologically challenging. Electrifying part of this route could be a huge challenge.
3. It runs though a much busier corridor. This is not good if you want to run a frequent service, especially if you're trying to serve lesser served areas of southern Ontario like London, KW, Stratford, Guelph, or even Brampton. The existing corridor has to deal with mainline CN traffic spur traffic from the Southern Ontario Railroad & other CN traffic from New York, 30 minute all day 2 way go service, numerous large yards, and other existing challenges.
4. Sure it's faster, but it's arguably a lot more difficult to upgrade speeds on the line further. The Kitchener line is far less used, so upgrades and expansions can easily be done.
Just because VIA uses the Hamilton routing now doesn't mean it's the best routing for a new service that's being built with new infrastructure.