While GO Transit started as a single train line in 1967, 15 buses were introduced on September 8, 1970, extending service beyond the original Lakeshore line to Hamilton and Oshawa, as well as providing service north to Newmarket and Barrie.
In 2000, GO Transit went beyond its existing train corridors and began service along Highway 407, linking York University to Oshawa, Mississauga and Oakville.
GO Transit began acquiring double-decker buses in 2007 to relieve crowding on some routes.
The first generation stood at a height of 4.3 metres, and second and third generations were built and acquired at even lower heights – in 2013 and 2016 at 4.15 and 3.9 metres, respectively – that allowed them to pass under lower bridges and trees and be used on additional routes.
[1][3][4][5][6] GO buses serve 15 bus terminals, as well as several local stops which include carpool/park and ride lots established by the Ministry of Transportation along Ontario highways.