Along Overlea Boulevard, cranes are swinging steel 14 metres above street level where, if everything goes to plan, driverless subway trains will eventually run. On February 18, 2026, four east-end stations broke ground at once: Don Valley, Flemingdon Park, Thorncliffe Park, Cosburn. Nearly three kilometres of elevated guideway is now under construction. That’s a lot of concrete in the sky.
A Line Built in Pieces
Most subway projects hand the whole job to one consortium. The Ontario Line splits it three ways: Strabag/Aecon got the southern section (Exhibition to Gerrard, six underground stations, twin-bore tunnels), Halton Hills Group (Ferrovial and Vinci) got Gerrard north to the Don Valley including the elevated guideway, and Connect 6ix (led by Hitachi Rail) handles rolling stock, signalling, and operations. The trains will be smaller and driverless, running at higher frequencies than current TTC subway cars. Think Copenhagen. Think Vancouver.
Why split it up? The Eglinton Crosstown. When Crosslinx Transit Solutions fell behind on that project, there was no way to bring in alternative contractors because the entire scope was bundled into one agreement. Dividing the Ontario Line was supposed to let Metrolinx manage each section independently and contain delays to one segment rather than letting them cascade across the whole project.
In theory.
Downtown Tunnelling
Station excavation is underway or completed at all downtown sites from Corktown to Exhibition, with crews now adding permanent station components. Tunnel boring machines launch from Exhibition later in 2026; a second launch shaft at Gerrard will send two additional TBMs north. At Queen and Spadina, a massive pit is forming. Queen-Spadina station will provide a direct transfer to Line 1 and sits beneath one of the busiest intersections in Toronto’s streetcar network.
That makes the dig considerably harder.
Above the Neighbourhoods
Contentious from the start. The elevated guideway through Thorncliffe Park and Flemingdon Park has residents in the high-rise towers along Overlea fighting the plan over noise, vibration, visual blight, and lost green space. Many of them are newcomers to Canada. The guideway will pass within 20 to 30 metres of apartment towers. Metrolinx has committed to vibration-dampening track beds and sound walls, but residents want full noise enclosures.
They argue, with some justification, that wealthier neighbourhoods would have gotten them.
Overlea Boulevard is already a construction zone: lane closures, truck traffic, dust. Flemingdon Park’s community centre has dealt with restricted access during construction phases.
Thorncliffe Park and Flemingdon Park are among Toronto’s most densely populated, lowest-income neighbourhoods. Two new transit stations matters. But the elevated structure will alter the character of these communities in ways that underground alignments would not. Everyone involved knows it. The original Relief Line proposal called for a fully underground alignment through the entire corridor: roughly $7 billion in 2016 estimates for a shorter route from Pape Station to downtown, fewer stations, no extension this far north. The province chose differently.
The Numbers
15.6 kilometres, Exhibition Place to Don Mills and Eglinton, connecting with Line 5 Eglinton. Metrolinx projects nearly 390,000 daily boardings. If those numbers hold, the Ontario Line would be one of the busiest rapid transit lines in North America per kilometre.
During peak periods, the line should reduce crowding by up to 15% on the busiest stretch of Line 1 between Bloor-Yonge and Wellesley. The Scarborough Subway Extension, by comparison, projects 105,000 daily boardings over eight kilometres.
The federal government is investing more than $4 billion, the single largest federal transit investment in Toronto’s history. Total project cost, as estimated in August 2024: $27 billion.
In 2019, when the Ford government first announced the project, the estimate was $10.9 billion.
$10.9 to $27 billion. That’s not a cost overrun. That’s a different project.
Jobs and Economic Impact
6,400 direct construction jobs at peak activity, per Metrolinx estimates, with thousands more in engineering, manufacturing, and supply chain roles. The community benefits framework sets hiring targets for local residents, apprentices, Indigenous workers, and equity-deserving groups.
These targets rarely survive contact with schedule delays and cost overruns.
Developers are already circling. East Harbour station, on the former Unilever site in the Port Lands, anchors a planned mixed-use development of up to 12 million square feet; Corktown station sits adjacent to the West Don Lands, one of Toronto’s fastest-growing residential neighbourhoods.
The real estate play around station sites may end up being the Ontario Line’s most visible legacy, for better or worse.
When Will It Open?
Not any time soon. Metrolinx originally said 2027. That was fiction. CEO Michael Lindsay now says early 2030s, possibly later than 2031.
“Based on where civil infrastructure is at this point, we think we’re still trending towards the early 2030s to be done with civil infrastructure,” Lindsay said. Testing after that. Then revenue service. The original Relief Line concept dates back to the 1980s, and riders on the overcrowded Yonge-University line have been waiting for a generation. A few more years of delay is predictable. Try selling that to commuters who’ve heard “transformative transit investment” from every premier since Peterson.
DVP Closure Risk
Ontario Line construction could “potentially” require a temporary closure of part of the Don Valley Parkway, Lindsay acknowledged.
Anyone who drives in Toronto knows what that means. The DVP already chokes under normal conditions; shutting even a section of it would cascade through every east-west surface route in the city. Metrolinx says it is exploring options to minimize the duration, but has not ruled a closure out. NDP Leader Marit Stiles called the project “another money pit” and “a bit of a boondoggle with the costs going higher and higher.” She is not wrong about the costs. Whether the result justifies them depends entirely on whether the line actually opens.
Four Megaprojects at Once
The Ontario Line is the centrepiece of the province’s Four Priority Projects: Scarborough Subway Extension, Eglinton Crosstown West Extension, Yonge North Subway Extension. Together, $10 billion in federal transit investment and tens of billions more in provincial and municipal funding.
Nothing on this scale has been attempted in Canadian transit history. Four megaprojects through one provincial agency. The same skilled labour. The same concrete. The same steel.
And the Eglinton Crosstown is years late and still not carrying passengers. Until that line opens, every Ontario Line groundbreaking photo op is a promissory note written on Metrolinx’s weakest credential.
Sources and verification: The February 18, 2026 station groundbreaking is from Government of Canada and Metrolinx announcements. The $27 billion cost estimate is from August 2024 project updates. The $4 billion federal investment is from Infrastructure Canada. The 390,000 daily boardings projection and 15% crowding reduction are from Metrolinx planning documents. Metrolinx CEO Michael Lindsay’s quotes on timeline and DVP closure are from CBC News reporting. Marit Stiles’s “money pit” characterization is from her public statements. The 15.6-kilometre route and station locations are from Metrolinx’s Ontario Line project page. The split procurement model and contract awards (Strabag/Aecon, Halton Hills Group, Connect 6ix) are from Metrolinx procurement records. The original Relief Line cost estimate of $7 billion is from City of Toronto planning documents, 2016. The 2019 initial cost estimate of $10.9 billion is from the Ontario government’s original announcement. Construction employment estimates are from Metrolinx’s community benefits framework. East Harbour development details are from Cadillac Fairview and City of Toronto planning applications.
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