The Background
To understand what OnCorr was designed to solve, you need to understand what came before it. Metrolinx had spent more than a decade delivering transit infrastructure through traditional procurement models — design-bid-build contracts, consultant-led design with contractor construction, sequential delivery stages. The results were mixed. Some projects delivered within budget and schedule. Many did not. And the scale of the programs being contemplated under Ontario’s transit expansion commitments — GO Regional Express Rail, the Ontario Line, the Eglinton Crosstown extensions — exceeded the capacity of traditional procurement to manage efficiently.
OnCorr — the Corridor and Station Infrastructure programs — was Metrolinx’s response. Rather than procuring individual projects through traditional competitive tendering, the agency structured large-scale, long-term contracts covering entire transit corridors. The theory was that corridor-scale contracts would produce better outcomes: deeper contractor investment in the program, more efficient supply chain development, better coordination across interdependent work packages, and more meaningful risk transfer to parties with the capacity to manage it.
The Consortium Structure
OnCorr contracts were structured as joint ventures between major infrastructure firms with complementary capabilities. The corridor contracts attracted some of the most significant infrastructure companies active in the Canadian market.
For Lines 1 and 2 (now identified as the Bloor-Danforth and Yonge-University subway corridors), the BACS consortium — bringing together major contractors with deep subway rehabilitation experience — took on the program. For Line 3, the ANM consortium led delivery. For Lines 4, 5, and 6 — the Sheppard, Eglinton, and Finch corridors — the FAST consortium structured the delivery approach.
The consortium model was intended to concentrate capability. A single consortium responsible for a full corridor could develop systems knowledge, supplier relationships, and workforce capacity that individual project contractors could not. The theory was sound. The execution created challenges that were not fully anticipated at the time of contract structuring.
What the Model Revealed
Large transit programs are not merely engineering challenges. They are commercial, financial, and governance systems that need to function together across very long delivery horizons. The OnCorr model revealed several structural tensions that deserve serious analysis, particularly for anyone structuring ambitious transit programs in the Gulf.
Corridor-scale contracts create market concentration in ways that reduce the competitive discipline that large programs normally benefit from. When a single consortium controls the delivery of an entire corridor — potentially across a decade or more of work — the owner’s leverage in commercial negotiations progressively diminishes as the program advances. The consortium has made significant system investments. Replacing them creates disruption that the owner cannot easily absorb. The contract must be designed to maintain commercial tension in the absence of competitive market pressure.
Scope uncertainty in transit rehabilitation programs — where the condition of aging underground infrastructure is only fully understood once the work starts — creates systematic change order pressure that the commercial framework needs to be designed to manage. In a corridor-scale contract, that pressure accumulates across a very large scope base. Change management frameworks that work for individual projects may not scale to program-level delivery without modification.
Governance at the program level is structurally more complex than project-level governance. The interfaces between the consortium’s delivery approach and Metrolinx’s operational requirements — maintaining service during construction, coordinating with other transit agencies, managing community impacts — require governance mechanisms that were still evolving as the programs advanced.
Lessons for Saudi Arabia’s Transit Ambitions
Saudi Arabia’s rail and transit programs — including Riyadh Metro’s ongoing expansion, Saudi Railway Organization programs, and the transit elements of giga-project delivery — face analogous structuring challenges. The scale is larger. The timeline is more compressed. And the institutional experience with transit P3 and progressive delivery is less developed than Canada’s, which itself was still learning.
The lessons from OnCorr that apply most directly to the Saudi context: ensure that contract scope is as well-defined as possible before award, build structured change management frameworks that can handle scope evolution without creating adversarial dynamics, design governance structures that match the pace of progressive delivery rather than the cadence of traditional procurement review, and maintain commercial mechanisms that keep consortium performance incentivized across the full program duration.
The OnCorr model’s ambition was correct. The execution challenges it encountered were instructive, not disqualifying. Saudi Arabia’s program authorities have the advantage of this experience to draw on as they structure their own corridor-scale delivery programs.