There is the aforementioned 2-car train, but it is the only one of that configuration.
At the beginning of this year VIA's Corridor cycle used 25 trains (the current schedule requires fewer), including the one above. Several trains (7, if I go by memory) were of fixed "top-and-tail" configuration, made up of a loco, a business class car, 4 economy coaches, and another loco. Three more trains had a single loco and a baggage car, a business class car and ranged from 3 to 5 economy coaches. Two trains were made up of Renaissance equipment, and operated only between Québec and Ottawa. The rest of the trains were between 3 and 6 cars and a single loco, almost always a single business and the rest economy coaches.
Dan