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For years, the Hazel McCallion Line was presented as a defining transit project for Mississauga and Brampton: an 18-kilometre route, 19 stops and a direct spine along one of Peel Region’s busiest corridors. Now, the agreement behind it has been fundamentally reworked. Metrolinx has split the original $4.6-billion public-private partnership into two contracts after delays, legal disputes and construction problems pushed expected completion from fall 2024 to early 2028.
The change is more than an administrative adjustment. It alters how Metrolinx and the private consortium Mobilinx share risk, costs and decision-making during the unfinished construction. It also leaves residents with a crucial distinction: early 2028 is a construction target, not a guaranteed passenger opening date. Testing, commissioning and a full revenue-service demonstration must still follow before the first public trip.
A Single Megacontract Becomes Two
Metrolinx Rewrites $4.6-Billion LRT Deal as Completion Slips Four Years
When Infrastructure Ontario and Metrolinx awarded the project in October 2019, Mobilinx received one sweeping design-build-finance-operate-maintain contract. The $4.6-billion agreement covered construction payments, a substantial-completion payment and monthly service payments over a 30-year operating and maintenance period. The model was promoted as a way to transfer appropriate risks to the private sector while keeping the railway publicly owned. Mobilinx was responsible not only for building the line, but also for financing parts of the work and then operating and maintaining the system once it entered service. At the peak of construction, the consortium estimated the project would support approximately 800 jobs. In theory, giving one private partner responsibility for almost every stage was meant to reduce fragmentation and provide a single point of accountability when problems emerged.
Instead, the project became tangled in schedule slippage, subcontractor disputes, financing pressure and disagreements over who should absorb the consequences of delays. Metrolinx has now separated the unfinished construction from the long-term operation of the railway. The remaining building work will move into an alliance agreement, while operation and maintenance will remain under the existing public-private partnership terms. Under an alliance model, the project owner, designers and contractors work through a more integrated structure, sharing responsibility for costs, risks, outcomes and rewards. Infrastructure Ontario describes the approach as non-adversarial and centred on “best for project” decisions rather than each party defending its own commercial position. Metrolinx says the rewrite resolves all commercial disputes connected to the project. The same consortium remains involved, but the rules governing its relationship with the province have changed during the most difficult stage of delivery.
A 2024 Deadline Has Become a 2028 Construction Target
The original contract called for the Hazel McCallion Line to reach completion in fall 2024. Major construction began in spring 2020, giving Mobilinx roughly four and a half years to deliver the 18-kilometre route between Port Credit GO Station and the Brampton Gateway Terminal at Steeles Avenue. That date passed without the line being finished. Large stretches of track remained incomplete, while crews continued working at major intersections along Hurontario Street. By April 2026, Metrolinx leadership was privately indicating that construction on the initial route was being targeted for spring or early 2028. The agency’s latest contract update now publicly describes the project as tracking toward 2028, a four-year slip from the contractual date announced in 2019. The revised timeline does not include the planned downtown Mississauga loop or the future extension into downtown Brampton.
Even the new target should not be confused with an opening date. Once construction is substantially complete, the line must move through final vehicle acceptance, systems integration, testing, commissioning, operator preparation and a revenue-service demonstration that imitates normal passenger operations. Signals, power systems, communications equipment, track infrastructure and vehicles must function together under different operating conditions before passengers are allowed aboard. Metrolinx has said it will announce a final opening date only after key testing milestones have been successfully completed. That caution reflects recent experience on other Ontario LRT projects, where visible construction was followed by lengthy periods of software testing, safety validation, staff training and trial service. For commuters, the practical message is that “finished in 2028” does not necessarily mean passengers will board in early 2028. It means the project could finally be ready to enter its last, highly technical stage after years of roadwork and missed expectations.
Rising Costs and Construction Problems Forced a Reset
The financial picture is more complicated than a simple comparison between $4.6 billion and the latest estimate. The original figure was adjusted for inflation and included construction-related payments, a substantial-completion payment and three decades of operating and maintenance payments. Metrolinx now says approximately $3.5 billion has been spent against an estimated $5.5-billion project cost that excludes operating expenses. A broader figure reported during the previous year, when operating costs were included, was slightly above $6 billion. The province says restructuring the contracts will not itself increase the project’s price, but the changing scope and accounting categories make today’s estimate difficult to compare directly with the number announced in 2019. What is clear is that the project has required substantially more time. Delays also bring financing, staffing, traffic-management and construction-mobilization expenses, even when those costs are not presented publicly as one straightforward overrun.
Technical trouble added urgency to the rewrite. In 2024, S&P Global Ratings reported that already-installed track had tolerance issues and did not comply with specifications in certain locations. Design changes and the reprocurement of special track were required while delays were occurring on several other fronts. Mobilinx’s credit rating was downgraded to BBB and placed under pressure as the schedule cushion protecting its lenders narrowed. The consortium had financed parts of the project using hundreds of millions of dollars in secured bonds and credit facilities, making continued delays a financial concern as well as a construction problem. Rework later became visible at key intersections, where track had to be replaced before testing could proceed. Legal disputes also surfaced with subcontractors over unpaid bills, rental equipment and other claims.
For businesses along Hurontario Street, the consequences were not theoretical. One shop owner told The Pointer that sales had fallen by approximately 40 per cent as difficult turns, concrete barriers and congestion discouraged customers, particularly older shoppers. Other businesses have faced changing entrances, restricted deliveries and customers choosing alternative routes to avoid construction. The City of Mississauga warned from the beginning that major work would disrupt residents and businesses, but the duration has extended far beyond the original expectation. The contract reset is therefore an attempt to solve a commercial and engineering problem that has already become a daily neighbourhood problem.
The Line’s Promise Remains, but Accountability Will Define the Finish
Despite the turmoil, the Hazel McCallion Line remains one of the most consequential transit projects in Peel Region. The planned system will include 19 stops along 18 kilometres of dedicated right-of-way, connecting Port Credit and Cooksville GO stations with Square One, the Mississauga Transitway, MiWay, Brampton Transit and Züm. Metrolinx identifies six transit or rail connections along the route and four major transit hubs. The electric light-rail vehicles are expected to operate in their own lane for most of the journey, reducing their exposure to regular traffic and creating a continuous north-south transit spine through two urban growth centres. Mississauga estimates that roughly one-quarter of the city’s residents and jobs will be located along the Hurontario corridor within two decades. That potential helps explain why local leaders have continued supporting the project while criticizing its delays, disruption and lack of firm public timelines.
The immediate question is whether the alliance structure can produce faster decisions without weakening cost control or transparency. Infrastructure Ontario notes that alliances can improve flexibility, increase collaboration and reduce adversarial disputes when project risks are difficult to predict. The same guidance warns that alliances require greater participation from the public owner and can produce a softer target cost if oversight or competitive pressure is insufficient. Metrolinx will therefore be sharing more responsibility for project outcomes rather than relying primarily on contractual risk transfer.
Separate expansion plans add another layer of uncertainty. Ontario is advancing detailed planning for a mostly tunnelled extension from the Brampton Gateway Terminal into downtown Brampton. Premier Doug Ford has also placed the estimated cost of the downtown Mississauga loop at approximately $1.6 billion, with the province expected to cover that amount. Neither addition is included in the early-2028 construction target for the initial route. Before celebrating an opening, the public will need clear reporting on remaining track work, systems testing, spending, the settlement of old claims and the incentives contained in the new agreement. Rewriting the contract may end the legal and commercial stalemate, but its success will ultimately be measured by whether a safe and reliable railway finally begins carrying passengers.
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