A subway line built to replace a scrapped subway line
The Ontario Line
The Ontario Line, a provincially-led subway project connecting Ontario Place to the Ontario Science Centre, emerged after the province cancelled a previous relief line plan the city had spent years developing.
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Toronto planners had spent years developing a "relief line" subway concept, intended to ease chronic overcrowding on Line 1 at its downtown core by giving riders an alternative route that didn't require passing through the busiest stations. In 2019, the newly elected Ontario provincial government scrapped the city's relief line planning work and announced its own alternative, the Ontario Line, taking over responsibility for the project's design and construction from the city through the provincial transit agency Metrolinx.
A longer, faster route
The Ontario Line as announced runs a longer route than the original relief line concept, extending from Ontario Place in the west to the Ontario Science Centre in the east, crossing downtown and connecting to several other subway and rail lines along the way. Construction began in the early 2020s across multiple sites simultaneously, with the province targeting completion later in the decade, making it one of the largest transit infrastructure projects underway in Toronto alongside the Eglinton Crosstown.
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