Ontario Line elevated guideway construction begins across Toronto’s east end
TORONTO — Toronto’s skyline is changing again — this time in the form of elevated subway tracks.
The Ontario government has officially broken ground on the Ontario Line elevated guideway and four new stations in the city’s east end, marking one of the most visible milestones yet in the largest subway expansion in Canadian history.
Crews are now working on a three-kilometre elevated stretch of track that will rise up to 14 metres above street level, connecting future stations at Don Valley, Flemingdon Park, Thorncliffe Park and Cosburn.
Once complete, this section alone will bring 30,500 residents within walking distance of a subway stop and improve access to nearly 15,000 jobs.
A Subway Line in the Sky
Unlike traditional underground construction, the elevated guideway will be one of the Ontario Line’s most visible features. Starting at Overlea Boulevard in Thorncliffe Park and extending north to Don Valley Station near Don Mills Road and Eglinton Avenue East, this raised alignment is designed to move trains efficiently through the corridor while minimizing impacts to existing roadways and neighbourhoods.
Premier Doug Ford called the Ontario Line a “game-changer” for the GTA, noting the project is part of Ontario’s broader $70-billion transit expansion plan.
The full 15.6-kilometre Ontario Line will include 15 stations, running from Exhibition Place through downtown Toronto and north to the Line 5 Eglinton connection at Don Mills Road. When operational, it is projected to support almost 390,000 daily boardings.
Reducing Congestion Across the Core
The Ontario Line is designed to relieve pressure on some of Toronto’s busiest transit corridors.
Key projected impacts include:
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Up to 22% reduction in rush-hour crowding at Bloor-Yonge Station
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Reduction of at least 28,000 daily car trips
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Cutting greenhouse gas emissions by approximately 14,000 tonnes annually
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Travel time from Thorncliffe Park to downtown reduced from 40 minutes to 25 minutes
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Pape & Danforth to Queen & University reduced from 25 minutes to 12 minutes
During peak periods, crowding on the busiest stretch of Line 1 between Bloor-Yonge and Wellesley is expected to drop by up to 15%.
Mayor Olivia Chow said the project will connect more people to jobs and housing while easing congestion on Toronto’s roads.
Jobs and Economic Impact
Construction of the Ontario Line is expected to support 4,700 jobs annually, with the province covering more than 80% of capital construction costs. The federal government is contributing over $4 billion toward the project.
Beyond mobility, the province has also identified transit-oriented community opportunities around stations such as Thorncliffe Park and Cosburn, where plans call for over 3,000 new homes and new mixed-use public spaces.
Todd McCarthy, Acting Minister of Infrastructure, said the line is part of Ontario’s broader $220-billion capital plan focused on long-term growth and economic resilience.
The Bigger Picture
The groundbreaking follows steady progress across the Ontario Line corridor:
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Bridges under construction over the Don Valley
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Excavation underway at Pape Station
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Work advancing at stations south of Bloor-Danforth
Together with the Eglinton Crosstown LRT, Scarborough Subway Extension, Yonge North Subway Extension, and GO Expansion projects, the Ontario Line forms the central spine of Toronto’s next-generation transit network.
For Thorncliffe Park and Flemingdon Park — long underserved by rapid transit — this elevated stretch represents more than infrastructure. It represents long-promised subway access finally moving from concept to construction.
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