Toronto has some of the pieces in place to make this happen with the GO Train network, particularly the Lakeshore lines that stretch from Oshawa (60km east) to

Toronto has some of the pieces in place to make this happen with the GO Train network, particularly the Lakeshore lines that stretch from Oshawa (60km east) to Hamilton (70km west). Unfortunately a lot of it hinges on electrification, which has been mired in administrative back and forth for decades and even the most ambitious plans still only call for 15 minute service: https://www.metrolinx.com/en/projects-and-programs/go-expansion-studies/go-electrification https://www.metrolinx.com/en/projects-and-programs/go-expans... Fare integration is another important piece— being able to jump on the GO to get out to a far-flung subway station like Main or Dundas West and continue your trip from there is a really nice prospect, but having pay separately for it kind of kills the vibe.