Alto High-Speed Rail: Why Canada's Toronto–Quebec City Line Could Cost $113B

Canada's high-speed rail dream just got a much bigger price tag. On October 1, 2026, the Parliamentary Budget Officer (PBO) released an analysis estimating that building the Alto high-speed rail line between Toronto and Quebec City would cost between $75 billion and $113 billion, well above the $60 billion to $90 billion range previously cited by the government and Alto. The watchdog's upper estimate sits $23 billion, or about 26%, above Ottawa's.

The report landed before a single kilometre of track has been built. Here's what the PBO actually said, why the numbers differ, what the line would look like, and what has to happen before construction, currently slated for around 2029, can begin.

Key takeaways

• The PBO's range is $75–113 billion for construction of the baseline Toronto–Quebec City route; Ottawa's working estimate has been $60–90 billion. The gap reflects different assumptions about route geography and international cost comparisons.
• Two big cost escalators: roughly 15 km of tunnelling in and around Montreal, and rock blasting through the Canadian Shield.
• The PBO assumes Canada builds like Europe, not like Britain or America, and warns that legislation meant to prevent UK/US-style overruns (Bills C-5 and C-15) still has to prove itself in court and in practice.
• The line: ~1,000 km of electrified, mostly dedicated track at up to 300 km/h, with stations in Toronto, Peterborough, Ottawa, Montreal, Laval, Trois-Rivières and Quebec City. Montreal–Toronto in about three hours.
• A possible Kingston stop is not included in the PBO's baseline estimate and would push costs higher.

What the PBO actually said

The PBO's analysis, requested by the Senate Committee on National Finance and released October 1, 2026, is the first independent cost assessment of the project. Its key findings:

• Construction cost: $75–113 billion (CAD) for the baseline route as initially proposed by the government. That's approximately $53–79 billion USD at current exchange rates.
• The broad range "reflects the considerable uncertainty inherent in large-scale rail infrastructure projects," in the budget office's words.
• The estimates are based on cost profiles of high-speed rail projects built around the world. Route length, tunnels and elevated structures are the strongest predictors of cost.
• The baseline excludes a potential Kingston stop. The federal government announced in June 2026 it would consider adding Kingston, and the PBO warned that adding it, along with additional tunnels or overpasses, could significantly increase costs.

Critically, the PBO's figures cover construction only. They exclude operating and maintenance costs. A second PBO report, focused on whether projected ridership will support Alto's operations, is expected later.

Alto's response, as reported in coverage of the release: the company views the PBO's range as broadly consistent with its working estimate and will refine route choices and costs through development, with an initial business case due in the first half of 2027.

Why the estimates differ: Europe vs. the UK and US

The $23 billion gap between the top of Ottawa's range and the top of the PBO's isn't a math error, it's a disagreement about which countries Canada resembles.

The PBO's analysis assumes planning and construction proceed the way past European high-speed rail projects did. European projects are the optimistic comparator: mature supply chains, experienced builders, streamlined approvals.

Recent projects in the United Kingdom and the United States, by contrast, came in far more expensive, driven by land acquisition fights, litigation, permitting delays and project-management problems. The PBO notes Canada has passed legislation (Bills C-5 and C-15) intended to mitigate exactly those governance, legal and delivery risks. But, the report cautions, the fate of that legislation in court and its actual effectiveness "will be crucial to addressing the financial risks of the project." In other words: the PBO priced in the European scenario but flagged that Canada hasn't proven it can deliver one yet.

Then there's the geography. PBO head Annette Ryan singled out two cost escalators: tunnelling in and around Montreal, about 15 km of tunnelling could be needed to connect Laval and Montreal, including the Mount Royal tunnel, and the complexities of the Canadian Shield portion of the route, where rock blasting adds major expense. Basic geographic realities like these, the PBO found, are strong cost predictors across the projects it studied worldwide.

What the line would look like

Strip away the cost debate and Alto is straightforward in concept:

• Route: approximately 1,000 km of electrified railway on mostly dedicated passenger tracks, addressing the chronic delays VIA Rail suffers from sharing freight-owned lines.
• Speed: up to 300 km/h, cutting Montreal–Toronto to about three hours.
• Stations: Toronto, Peterborough, Ottawa, Montreal, Laval, Trois-Rivières and Quebec City. (Kingston is under consideration but not confirmed.)
• Operator model: Alto is a federal Crown corporation, originally created as a VIA Rail subsidiary, incorporated November 29, 2022, acting as project authority. The private development partner is Cadence, a consortium selected in February 2025 that includes CDPQ Infra, AtkinsRéalis, Systra, Keolis, Air Canada and SNCF Voyageurs. Co-development launched March 31, 2025.

The corridor the line would serve houses nearly half of Canada's population and accounts for roughly 40% of national GDP, which is the economic logic for building here first.

Where the project stands now

Alto is still deep in the pre-construction phase, and the timeline is long:

• Development budget: $4.3 billion allocated; $265.9 million spent so far, with construction still years away.
• Co-development is proceeding through four pre-construction stages, from initial agreements through to 50% design completion. The approach designs route segments between city pairs to reduce delay risk and allow useful service before the whole line is finished.
• Construction is slated for around 2029. Alto CEO Martin Imbleau has said phased construction is expected to start in 2029 or 2030, with the first of four route segments completed 6–8 years after construction starts and the full network finished in 12–14 years, roughly 2041–2044.
• The first phase would run between Ottawa and Montreal, announced by the federal government in December 2025.
• The project has been referred to the Prime Minister's Major Projects Office, and Carney has publicly pointed to the $90 billion figure as a way to give Canadians "more choice" in transportation.

The PBO also estimated the construction phase's economic impact as "modest": $1.8–2 billion in additional GDP between 2029 and 2033, and 4,300–9,000 jobs. (The government has separately cited larger figures, 51,000 construction jobs and up to $35 billion in annual economic contribution, from its own earlier modelling.)

The politics: a $23 billion argument

The PBO report immediately became political ammunition. Conservative transportation critic Dan Albas called the $23 billion gap above government projections evidence of a coming "boondoggle," while noting the estimate doesn't even include the Kingston addition. The Bloc Québécois has raised concerns about the project being expedited without adequate scrutiny.

The politics are complicated by geography. The station map gives Quebec multiple beneficiary stops beyond Montreal, including Trois-Rivières, a metro area of about 161,000 people, while much of rural Ontario absorbs corridor impacts without a station. Ontario's government has pushed for a Highway 401 alignment and a Kingston stop; some Eastern Ontario municipalities have opposed the project in its current form. Support is strongest where the train clearly stops (Peterborough, for example) and weakest where the line cuts through land without one.

None of this kills the project, but it explains why the PBO's number matters beyond accounting. A megaproject's budget is also its political coalition, and $113 billion is a harder coalition to hold than $90 billion.

What to watch next

Three milestones will determine whether the PBO's range or Ottawa's proves closer to reality:

1. Alto's initial business case (first half of 2027), the first detailed cost, ridership and route document. This is where the $60–90B vs. $75–113B debate gets real numbers.
2. The second PBO report, on whether projected ridership can support operations. Construction cost is only half the question; a line that can't cover its operating costs is a permanent liability.
3. The Kingston decision and the court fate of Bills C-5 and C-15, both directly affect the final number, in opposite directions.

The bottom line

The PBO didn't say Alto can't be built or shouldn't be built. It said that, priced against how high-speed rail actually gets built around the world, and against the specific geology of the Toronto–Quebec City corridor, the honest construction range is $75–113 billion, not $60–90 billion. The $23 billion gap at the top end is the cost of optimism about Canadian project delivery that hasn't been demonstrated yet.

Whether that optimism is warranted will be decided by legislation that hasn't been tested, a business case that hasn't been published, and a ridership analysis that hasn't been done. Until then, the intellectually honest number to use is the watchdog's: up to $113 billion, with the Kingston question still open.

Sources

• Parliamentary Budget Officer, PBO report assesses costs and economic impacts of Alto's Eastern Corridor high-speed rail project (Oct 1, 2026)
• Trains.com, New estimate increases projected cost of Canadian high-speed project
• EuropeSays, Carney's high-speed rail could hit $113B as PBO blows past Ottawa estimate
• Particle News, PBO Puts Toronto–Québec High-Speed Rail Construction at $75–$113 Billion
• Transport Canada, Alto (Crown corporation mandate)
• [Wikipedia, Alto (high-speed rail)](https://en.wikipedia.org/wiki/Alto_(high-speed_rail))