Why focus on the train notion? The last few years has seen a massive development in Halton county from Milton east through to Mississauga. Whilst all that mud was flying would have been the perfect time to construct a dual track interurban system parallel to Derry Road and meeting up with the GO at some point enroute. Every one of these new subdivisions you have mentioned in whatever city should have a transit system as part of its construction strategy. Something like this. Flat fare of 3 Euros, it travels at 70 kmh between stops and has a neat gadget that allows the driver to call up a green light at an intersection so there is very little delay.
strategy.
View attachment 101832