I've been watching the late Newton Rossiter's movies of CPR and CNR railroading in Southern Ontario.
On the climb up the Niagara Escarpment on the CPR Galt Subdivision, a number of doubleheaders are shown passing the Campbellville, Ontario depot.
I'm, trying to figure out where that depot stood. My best guess, based on Google Earth, is that it was at the NW quadrant of the intersection of Main Street and the railroad tracks, diagonally opposite from where the Thai House restaurant is today. Also is the Thai House located where there used to be a brick manufacturer?