Wait till you hear about how much money the US (and Canada) spent to bail out private railroads. The same railroads that are openly hostile to running nationalized passenger rail. Even being allowed to have passenger train wheels touch their tracks is like pulling teeth so we can forget about actual, functional intercity rail like they have in the developed world.
In a lot of cases I don’t think you’d want passenger cars on those rails…
We have plenty of traffic on the Trans Canada Highway between cities that could be diverted away from car travel. Intercity bus service as well. The prairies is especially good for high speed rail because you can build perfectly straight tracks at ground level for long distances since it’s mostly farmland, and there are aready many straight trunk roads they can share corridor with, which could potentially start competing with planes if they go at the higher end speeds that already exist in the industry, and downtown to downtown. Bombardier even made high speed trains before we lost them. And certainly more environmentally friendly than planes and cars.