Construction advances on Toronto's $27 billion Ontario Line subway project
Toronto’s $27 billion Ontario Line subway project is advancing rapidly, with several underground station sites now beginning to take recognizable form. The 15.6-km line will add 15 new stations, connecting Exhibition Place in the southwest to Don Mills and Eglinton in the northeast—one of the city’s most ambitious infrastructure undertakings in decades.
Metrolinx reports that key downtown sites, including Moss Park, King-Bathurst and Corktown stations, are showing significant progress as excavation transitions to structural construction. At Moss Park, crews have completed the main dig and begun forming permanent concrete and rebar foundations that will support the future tracks and center platform.
Farther west, the King-Bathurst site resembles a vast underground cavern roughly 40 m below street level, carved using deep mining methods. At Corktown, major excavation work beneath Front Street has revealed the outline of the station box that will eventually house twin tracks and passenger platforms.
The Ontario Line’s central tunnel section will connect these downtown stations before continuing eastward, with twin tunnel boring machines expected to launch soon from Liberty Village. The line is designed to relieve pressure on Toronto’s busiest transfer points at Bloor-Yonge and St. George, providing a faster, more direct route through the downtown core.
Once complete—targeted for 2031—the Ontario Line is expected to transform Toronto’s transit network, reducing congestion and reshaping key corridors across the city with new tunnels, bridges and stations that redefine the urban landscape.
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