Toronto’s Line 5 didn’t stop at Mount Dennis on opening day. The 9.2-kilometre Eglinton Crosstown West Extension is already under construction and will carry the new light rail line another seven stations west into Etobicoke, with provisional plans to reach Toronto Pearson International Airport in a later phase.

Project Scope

The C$3.97 billion extension splits into four contracts under Infrastructure Ontario’s P3 delivery model. The lead contract, Advance Tunnel, went to the West End Connectors joint venture of Aecon, Dragados, and Ghella in 2021. Twin tunnels are being mined with two Herrenknecht earth-pressure-balance TBMs running from Mount Dennis west under residential neighborhoods and the 401 corridor.

Seven new stations make up the alignment: four underground (Royal York, Islington, Kipling, and Renforth Gateway), two elevated (Scarlett Road and Jane), and one in an open trench (Mount Dennis tie-in). Stations are at a different scale than the original Line 5 build, with deeper boxes and more constrained urban surface access. Several stations sit within metres of existing surface rail or major arterials, requiring sequenced cut-and-cover work alongside live rail and traffic operations.

The systems contract for power, signalling, and communications was awarded separately, and Alstom is supplying the same Citadis Spirit LRV fleet that already runs the main line. Forecast daily ridership at full opening is 96,700 boardings.

Why It Matters

The extension is the first major piece of Toronto’s transit plan that lands after Line 5’s main-stem opening in February. The political backdrop is heavy. The main line opened roughly four years late and over budget, and Metrolinx’s delivery practices are under intense provincial scrutiny. The West Extension is being watched as the test of whether lessons from the main-stem build are real, or whether the same patterns repeat.

Operationally, the project also matters for the air-rail link. Pearson is one of two North American hubs that doesn’t have a direct heavy rail or LRT connection, and the long-range planning case for the extension is tied to closing that gap. The first phase only reaches Renforth Gateway, but the alignment and station designs are sized to accommodate the airport extension that’s targeted for the early 2030s.

For the build itself, the next watch items are tunnel breakthrough and station box completion. The TBMs are progressing at the design rate, with eastbound mining ahead of westbound. Station finishes and systems fit-out are the long pole, and Metrolinx hasn’t published a public opening date for the extension beyond “early 2030s.” The Aecon/Dragados/Ghella JV has been clear that the schedule depends on systems integration, which is the same scope that delayed the main-stem opening.

Project Team & Details