Upon full buildout, there is supposed to be anywhere from 4 to 8 tracks along the Kitchener corridor, between Bathurst (the start if the Union Station Rail Corridor, where all trains come together) and Highway 427 (where the UPX spur splits off to the airport). There are at least four that are shared for the Kitchener line and the UPX along the entire length. You have more in the following areas:
- Two for the Barrie line, between Bathurst and Parkdale (Lansdowne)
- Two for the Milton Line, between Bathurst and West Toronto (Dupont)
- One or two for Canadian Pacific's mainline to northern Ontario (MacTier sub), between West Toronto and east of the Weston Road overpass
- One or two for Canadian National's industrial spurs, between Etobicoke North GO and Carlingview Drive
You will not see all of this first hand today, because it has not been fully built out. But it leaves little room for SmartTrack, to be sure, and it is why I have generally dismissed it from day 1. Note that we haven't seen cost estimates for SmartTrack yet, and the price will be significant for any property requirements, as it will be beyond the existing corridor (there's no Metrolinx-owned space left).