Ontario Line's First Tunnel Boring Machine Breaks Through at Future King West Station

The first tunnel boring machine working on Toronto's Ontario Line has broken through to the future King West Station, the province said Friday — the first time a TBM has reached a station cavern on the new subway. The machine, nicknamed Libby, has travelled about 1.3 kilometres from its launch shaft east of Exhibition Station since tunnelling began in April, installing roughly 780 tunnel lining rings along the way, according to an Ontario Newsroom release.

"Every kilometre of tunnelling brings us closer to delivering a new subway line that will transform how people travel across Toronto," Transportation Minister Prabmeet Sarkaria said in the release. Crews will test and maintain Libby at King West before it continues toward the future Chinatown Station. A second TBM, Corkie, is excavating the parallel tunnel and is expected to reach King West in December, the province said.

First downtown subway tunnels in decades

Libby and Corkie are digging twin tunnels as deep as about 40 metres beneath downtown streets for roughly six kilometres, from Exhibition Station toward the Don Yard near Lakeshore Boulevard and the Don Valley Parkway — the first subway tunnels bored under the downtown core in more than 60 years, CP24 reported when tunnelling started in April. Metrolinx said the machines are named for Liberty Village and Corktown, the neighbourhoods that bookend their underground journey, and that they will break through station caverns at King West, Chinatown, Osgoode, Queen, Moss Park and Distillery District before finishing at the Don Yard portal.

Premier Doug Ford called the April start of tunnelling "historic," and Mayor Olivia Chow said the line would eventually bring rapid transit access to nearly 230,000 residents, CBC News reported. Metrolinx CEO Michael Lindsay cautioned then that the job's complexity is "tremendous" and that the start of tunnelling did not yet mark the beginning of "major construction progress," while confirming a target opening in the early 2030s, per CP24.

What King West Station is meant to do

King West Station sits at King Street West and Bathurst Street in the Fashion District. The province says it will put 27,000 people and 24,200 jobs within walking distance of rapid transit and is expected to serve about 5,100 customers in the busiest travel hour, including about 2,400 transfers to services such as the TTC's 504 King and 511 Bathurst streetcars, according to both the Friday release and Metrolinx's King West Station page. Metrolinx's site lists those ridership figures as a 2041 forecast and notes that Infrastructure Ontario has proposed a transit-oriented community at the site.

Infrastructure Minister David Piccini said Friday the government is planning a transit-oriented community at King West that would deliver nearly 680 new homes, per the Newsroom release. When tunnelling launched in April, Metrolinx confirmed renamed stations meant to match local neighbourhoods: King-Bathurst became King West, Queen-Spadina became Chinatown, Corktown became Distillery District and Riverside-Leslieville became Leslieville, CP24 reported. Excavation at King West was already complete by that April update, Metrolinx and the province said at the time.

A line meant to ease Line 1 crowding

Once finished, the 15.6-kilometre Ontario Line is expected to connect Exhibition Place to Line 5 Eglinton at Don Valley Station, accommodate nearly 390,000 daily boardings and bring nearly 230,000 more people within walking distance of rapid transit, while supporting about 4,700 jobs a year during construction, Friday's release said. During peak periods, the province estimates the line could cut crowding by up to 15 per cent on the busiest stretch of TTC Line 1 between Bloor-Yonge and Wellesley and trim some cross-city trips by as much as 40 minutes.

Ontario says it is investing nearly $70 billion in public transit, including the Ontario Line, Scarborough Subway Extension, Eglinton Crosstown West Extension and Yonge North Subway Extension. The federal government is contributing more than $4 billion toward the Ontario Line, the province noted — a figure CBC also reported at the April tunnelling launch. CP24 reported in April that Metrolinx's then-latest overall cost estimate for the line was $29.5 billion, up from the original $10.9 billion announced years earlier.

Friday's breakthrough does not put trains in service. It does mark the first station reached underground on a project that still has years of tunnelling, station finishing and testing ahead. Libby's next stretch toward Chinatown, and Corkie's December arrival at King West, will be the next visible underground milestones riders can track while the early-2030s opening target remains Metrolinx's public guidepost.