You do have to buffer those times a bit. The HS trains I've taken are slower until they leave the city, there is acceleration and deceleration time as well. But perhaps a bit over an hour Edm to Cgy.
I'm doubtful on the numbers for your Banff train as well, no way are they getting a track straight enough for 350km/h. I suspect even half that speed would be a challenge. Here are some sample curve radii for various speeds, you can see how a radius 7km is needed for 350km/h.
https://en.wikipedia.org/wiki/Minimu...um_curve_radii