GO Transit is a regional public transit system serving the Greater Golden Horseshoe region of Ontario, Canada. With its hub at Union Station in Toronto, GO Transit's green-and-white trains and buses serve a population of more than seven million across an area over 11,000 square kilometres stretching from Kitchener in the west to Peterborough in the east, and from Barrie in the north to Niagara Falls in the south. From Wikipedia