Since, I'm super old, there is a 80s movie with John Candy called "Planes, Trains and Automobile" and was our exact situation this past Monday.
We flew from Toronto to Montreal for our interview on Tuesday and took the train back and then car home to Cambridge, ON. The roundtrip flight per person was going to cost ~700 CAD per person.
Yes, the train was super easy/economical. There was free WIFI so you're not as bored.