My wife and I (senior citizens) would like to fly from Toronto to Calgary. The goal is to see Banff and Glacier National Parks. Is it possible to take a train from Calgary to Banff-to Glacier and return to Calgary? We'd like to tour around in the two parks for two day or so each, including Lake Louise. If not by train, any suggestions for this itinerary that would avoid rented car? Thanks a million for your advice! Oh, this is a limited budget trip.