CN electric Box Cab 6710 and 6712 lead VIA 6541 and its train from the Mount Royal tunnel where diesel and steam locomotives were not allowed to operate. VIA 6541 was on the overnight train from Montreal to Senneterre, Quebec.
Either a freight train being helped over a steep grade or a long passenger or freight train requiring more engines. This album includes Helpers and double heading trains of the old days both steam and diesel.