I always thought all those Hydro corridors that crisscross Toronto would make great Light Rail routes. Some of them, like the one that goes diagonally from Pickering and Northeast Scarborough to Eglinton and the Don Valley Parkway would be a perfect way to funnel the 905ers and Scarberians to the core.
Another crosses parallel to McNicoll completely across Scarborough and North York to highway 400.
If I knew how to link Google Maps, I could demonstrate the swath these Hydro rights of way cut through Toronto.
Additionally, there would be far less disruption to traffic and neighbourhoods because the path is cleared and ready to go. Plus there is already unlimited electricity available to power the trains!
Just a thought, I'm sure there are too many nimby's and other reasons that it would be a bad idea.