Once the RFQ period has closed, Infrastructure Ontario and Metrolinx will evaluate the submissions and announce a shortlist of qualified proponents in early 2022. The qualifiers will then be invited to submit detailed proposals on the design and delivery of this package of work as part of the RFQ process.

The 7.8km three-stop line is divided into two separate contracts of work to expedite its successful delivery. In May 2021, the province awarded a US$590m design, build and finance contract to Strabag for the SSE tunnel; this was followed in June by the official ground breaking for the project.

As one of four priority subway projects in the Greater Toronto Area, the SSE is a core component of the Province’s historic US$22.2bn subway expansion programme – the largest in Canadian history – which also includes the Ontario Line, the Yonge North Subway Extension, and the Eglinton Crosstown West Extension. Together, these projects will add more than 40km of new subway service to the rapid transit network. Up to 40% of eligible costs for the projects will be funded by the Canadian government.