And then there is the question "What does HSR mean?"... 200kph; 300 kph, 500 kph? For arguments sake if we use 500 kph (average accounting for acceleration/deceleration between stations) then the travel time to Calgary's YYC from Edmonton's YEG along the most efficient route is 246 kilometers (as the crow flies), taking about 1/2 an hour. If Red Deer was made a stop it could be achieved with a "side rail" spurring off the direct route between Edmonton and Calgary (that might be the most politically acceptable, especially if the connection was to Red Deers airport) with choices for either a midpoint stop or not when traveling between Alberta's two major cities.
For arguments sake? This is an impossible set of parameters to use for a realistic argument! Show me a conventional HSR that operates at 500 km/h.
And the then an arrow straight route? Not realistic.
I'm not even sure if there is a maglev line that operates at 500 km/rh, and while some conventional HSR's have tested trains at well over 400 km/h under special circumstances, none operate over 400 km/h.
Realistic is 350 km/h. That is what California's HSR is designed for, and Amtrak's new Alstom HSR sets are designed for around 350 km/h, although I don't know if the NE Corridor infrastructure support that yet, beyond maybe a few sections.
A realistic route length would be similar to the QE2. Realistically the line is likely to be cheapest if it uses an existing corridor where possible, be it the QE2 or CPKC. The CPKC is slightly longer.
QE2 corridor 300 km, 350 km/h so a much better number would be an hour or so city to city (51 minutes, but being generous with 9 extra minutes for acceleration and deceleration and anything else that could occur). Add on maybe 5 minutes per extra stop so 1 hour 15 minutes or less Edmonton to Calgary with stops at both airports and Red Deer.
Most lines run multiple services.
Most likely it would alternate between a downtown to downtown express and then a Edm-YEG-Red Deer-YYC-Cal service.
I think that would be the way to go. The best would probably be 3 levels of service with a local commuter-type service as well. Greyhound used to do this, and I believe Red Arrow still does. Most trips are semi-express between Edmonton and Calgary with a stop in Red Deer, with a few trips that are express and bypass Red Deer. Greyhound also had a local service that stopped at all of the small communities.
The great thing for a commuter train would be that using a HSR line will give commuter trains a much higher speed potential than something diesel hauled on existing track, so an average speed of 200 Km/h could be achievable for a commuter train. That could then allow communities like Lacombe and Ponoka to be within a 40 minute commuter train ride of Edmonton, ditto for everywhere between Calgary and Olds. What might be required for an overlapping commuter service would be 3 tracks to allow a place for locals to stop and stay out of the way for express and semi express trains.
For the cost of the infrastructure we would need to absolutely maximize it's usage.