A video of the Toronto Union Station to Airport express train going the full distance in a fast video. There are only two stops along the 25 minute ride. the track elevation was changed to allow the train to go under a number of level crossings. there are 4 tracks, 2 for the airport express, 1 for Go Transit and 1 for CN rail.
http://globalnews.ca/news/1953705/1953705/
Joe K