Yonge Street Subway Route Map

The first Toronto subway, running under Yonge from Union Station in the south to Eglinton Station in the north, was officially opened on March 30, 1954 - https://www.toronto.ca/city-government/accountability-operations-customer-service/access-city-information-or-records/city-of-toronto-archives/whats-online/web-exhibits/canadas-first-subway/