Long-distance rail travel isn't attractive
"Canada isn't Europe" because we privilege freight over passengers and don't have coastlines conveniently extending well into all parts of the continent such that ships and trucks can move most goods efficiently enough (where there are existing ports). The freight vs passengers paradigm extends into the highly dense strip which does coincide with convenient coastlines (great lakes) and port facilities because the bones of the inadequate-for-dual-use infrastructure were laid down long ago. Long-distance passengers also need access to local transportation, but the infrastructure for that, too, has primarily grown up to serve patterns established by existing road networks and airports.
It would be costly. Something I was recently mulling on: the original 115 km of Coquihalla highway cost somewhat more than $3.5M per km in 1986. It's a four-lane highway which includes some difficult terrain stretches and severe seasonal weather shifts. Adjusted for inflation, that would be almost $9M per km.
The project to widen Hwy 1 from Langley to Abbotsford is estimated to cost $250M per km, despite following an established sufficiently wide right-of-way on what is just some slightly high ground next to the Fraser River delta.
I have no exact notion why costs have exploded so much, but must suppose based on other observations (infrastructure projects) that the phenomenon is widespread. So the question: how much would it cost per km to supply European-style passenger rail service in the "1200 km linear corridor", and how much in total for a reasonable network?