GO Transit provides commuter rail service to the suburban areas, carrying over 70 million passengers a year. Originally operating only a train line east-west along the suburbs sprawled across Lake Ontario, it has since expanded into bus service as well. While transit integration with the TTC is starting to take shape with the Presto smart card, fares were still separately charged by each operator and it was not possible to traverse the Greater Toronto Area under a single fare until early 2024.

















Union Station is Toronto's transportation hub for intercity rail, commuter trains, and subway. It is the terminus station for all GO train lines. Every year, 41 million users of commuter rail and bus, 2.3 million intercity passengers, and 20 million subway users pass through Union Station. It is a designated National Historic Site of Canada and is protected by a Heritage Easement Agreement between Parks Canada and the City of Toronto. It opened on August 6, 1927 by the Prince of Wales at a ceremony attended by Prince George, British Prime Minister Stanley Baldwin, and Canadian
Prime Minister William Lyon Mackenzie King. The station is undergoing a renovation, with an additional subway platform and also a new roof over the suburban railway station.
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