I think it is totally reasonable to think that the Calgary-Edmonton corridor is potentially investment-worthy for the nation. It features large metropolitan areas with 1.5 million people each that are located within quite a reasonable travel time. I believe trains could travel that corridor within two hours of one another. That would allow for 90% or more market share between Calgary and Edmonton, which would be a dramatic change, given that there's currently no rail service, as far as I know, between those two metropolitan areas.
In addition, the Calgary-Edmonton corridor has some advantages over the Toronto-Montreal corridor just in terms of investment, because it is over land that features fewer geographic obstacles, so it could be cheaper to build per mile or kilometre.