The Toronto subway is an urban rail transit system serving Toronto and the neighbouring city of Vaughan in Ontario, Canada, operated by the Toronto Transit Commission (TTC). The subway system is a rail network consisting of four rapid transit lines: three subway lines that operate predominantly underground and one light rail line that primarily runs at-grade.
In 1954, the TTC opened Canada's first underground rail line, then known as the "Yonge subway", under Yonge Street between Union Station and Eglinton Avenue with 12 stations. As of 2025, the network encompasses 87 stations and 80.4 kilometres (50.0 mi) of route. In 2024, the system had a ridership of 331,789,000, or about 1,079,700 per weekday as of the third quarter of 2025, making it the busiest rapid transit system in Canada in terms of daily ridership. As of December 2025, there are 43 stations under construction as part of a new light rail line (running mostly underground), and a new rapid transit line (running both underground and on elevated guideways). And two extensions to existing lines.
