Those numbers are pretty much irrelevant. Canadians arent evenly distributed throughout the country (nor throughout Ontario. That province is empty other than a tiny corner of it), the overwhelming majority of them live in a few areas that are quite population dense (i.e. metro-Vancouver area, Edmonton/Calgary axis, and the corridor from Toronto to Montreal.

Besides, Canada used to have a much more extensive train network back in early 1900s when the population was a tenth of what it is now.

Canada could have functioning train networks if we wanted them.