Recently, GO Transit celebrated a recent milestone of 50 years of bus operation in the Greater Toronto and Hamilton area. Initial services saw GO bus services reach out west to Hamilton, east to Oshawa, and north to Newmarket. In comparison to today, GO bus services reach out as far west as Brantford, south to Niagara Falls, north to Barrie, and east to Peterborough. Quite a bit of growth within 50 years!
Metrolinx released an article commemorating this milestone which is available through this link, it is a great read outlining the last 50 years of operation.