The Government of Canada pays CN to upgrade a lot of their lines on behalf of Via. For example, all of the triple-tracked segments on the Kingston sub were paid for in Via's name.
The fact that Brightline and FEC were able to create an agreement to balance dispatch priorities on the rails owned by FEC further undermines
@Admiral Beez 's claim that passenger operations cannot operate successfully on rails owned by a freight company.
I think that HFR should have its own rails, but the fact remains that some passenger companies can operate successfully on rails owned by a freight company.