Logistics would be different: The Adirondack to Montreal is purely an Amtrak train running non-stop between the Border and Montreal Central Station. (the current stop at suburban St. Lambert is to be eliminated when the proposed Customs facility opens) Same in Vancouver. Purely an Amtrak...

Yes......Already there:

'Union Station'.......how it might have looked.....and note that 3 legged CN Tower! (from CN's 'Keeping Track” employee magazine January 1969)

Here's some shots from 1974...