This announcement makes me wonder about possible future extensions to a network in the west. Winnipeg and Vancouver would be cities that could be connected. Winnipeg may have trouble generating ridership with a lower population and lackluster transit culture however an extension eastward would include one or both of Saskatoon and Regina who could potentially make the extension possible. Vancouver is a whole different animal, it would likely have very good ridership and demand as the biggest population centre in the west and having a decent transit culture, however building through the mountains would be an absolute headache no matter how you slice it. The most likely option in my opinion would be a line that mostly follows the Yellowhead Highway going Edmonton to Jasper crossing into BC via the Yellowhead pass and dropping into the Thompson Valley to Kamloops and then following the Coquihalla to the Fraser Valley and Vancouver. A direct Calgary to Vancouver route would be a nightmare as the line would somehow need to fit into the narrow, winding and already incredibly busy Kicking Horse Pass, which would be near impossible unless the trains shared tracks with freight which would be a disaster. If that was achieved it would then need to contend with Rogers Pass which is incredibly avalanche prone not too mention also narrow and busy. So I think if Vancouver were to be connected to this network it would need to be via Edmonton and through the Yellowhead pass.
Edit: Unless they pulled a Europe and just tunneled under the mountains lol.