Why HS2 Failed — And What Europe Should Learn

On 4 October 2023, standing at the podium of the Conservative Party Conference in Manchester — the very city whose rail link he was about to kill — Prime Minister Rishi Sunak announced the cancellation of HS2’s northern leg. The Birmingham–Manchester section, representing the most strategically important element of the original Y-shaped network, was scrapped after 15 years of planning, £2.3 billion spent on preparatory work, and costs that had risen from an original £37.5bn estimate for the full network to over £70bn for Phase 1 alone.

The decision was, depending on one’s perspective, a rational response to runaway costs, a catastrophic failure of political nerve, or the inevitable consequence of a project that was misconceived from the outset. What it unambiguously was, however, was the most significant failure of a major European rail project in the 21st century — and a case study that every government currently planning or building high-speed rail must study with forensic attention.

This article analyses exactly why HS2 failed: the governance failures, the contracting errors, the political miscalculations, and the structural problems in Britain’s planning and construction system that made cost overruns not merely likely but mathematically inevitable. It then draws seven specific, actionable lessons for the European HSR projects currently in development — from Rail Baltica to Lyon–Turin, from Sweden’s Ostlänken to the Czech Republic’s nascent HSR programme — before they repeat Britain’s mistakes at continental scale.

The HS2 Story: A Timeline of Decisions and Consequences

Why HS2 Failed: Seven Root Causes

Reason 1: The Original Cost Estimate Was Never Honest

The foundational error of HS2 was committed in 2010, when the project was approved with a £37.5 billion cost estimate for the full Y-shaped network. This figure was not based on detailed engineering design — at the point of approval, HS2’s route had been outlined but not engineered. It was a politically calibrated number: high enough to convey that the project was serious, low enough to secure ministerial and eventually parliamentary approval.

Professor Graham Winch of the University of Manchester, whose February 2025 paper for the Productivity Institute provides the most rigorous academic analysis of HS2’s failure, describes this as a systemic problem: “Saying how much the project would cost early on — with so little design work completed — was a key mistake for managing expectations later.” Oxford’s Professor Bent Flyvbjerg, whose decades of megaproject research identified the phenomenon of “optimism bias” in infrastructure planning, puts it more directly: project promoters routinely present costs that they know to be underestimates because honest costs would prevent approval. Once approved, sunk cost psychology makes cancellation politically impossible.

The 2025 James Stewart review — commissioned by the new Labour government to diagnose HS2’s failures — confirmed this explicitly. It found that cost estimates throughout the project’s history had been produced “without adequate design development” and that the delivery organisation (HS2 Ltd) and its sponsor (the Department for Transport) had consistently presented “best-case” scenarios to ministers rather than realistic ranges.

Reason 2: Contracts Were Awarded Too Early

In March 2017, just one month after the HS2 Phase 1 Hybrid Bill received Royal Assent, four large design-build contracts were awarded to international joint ventures for the main civil engineering works. The total value of these contracts exceeded £15 billion. At the time of award, the detailed design of the railway — the engineering drawings that specify exactly what is to be built — was far from complete.

The Institution of Civil Engineers’ Next Steps programme, which interviewed key HS2 decision-makers after the northern leg cancellation, identified this as one of the project’s most consequential errors. “The contracts were awarded too early on Phase 1. There had been too little design development or risk mitigation — particularly for such large contracts.” Including design development within the contracts meant HS2 Ltd could not act as the “guiding mind” for technical development. Instead, the contractors — with their enormous financial leverage — were able to negotiate scope changes, claim variations, and renegotiate terms. By the time the true cost implications were visible, billions had been committed and billions more were contractually unavoidable.

The contrast with the Gotthard Base Tunnel is instructive. Switzerland’s Federal Office of Transport maintained tight technical control throughout the 17-year project, with contracts awarded only after design development was mature and cost estimates were based on detailed engineering. The result was a project delivered within its long-term budget projections — despite running through 57 km of some of Europe’s most challenging Alpine geology.

Reason 3: The Specification Was Gold-Plated for Political, Not Engineering, Reasons

HS2 was designed to operate at 360 km/h — faster than any current operational European HSR line, and 40 km/h faster than China’s CR400 Fuxing on its fastest corridors. This specification was not driven by transport need: a railway designed for 300 km/h would have delivered virtually identical journey times on the London–Birmingham–Manchester corridors (saving perhaps 8 minutes on London–Manchester), at significantly lower cost.

The 360 km/h specification drove enormous cost implications throughout the design. Curve radii at 360 km/h must exceed 7,000 m — requiring more tunnelling, more earthworks, and more land acquisition than a 300 km/h design. The Colne Valley Viaduct, while a remarkable engineering achievement, is 3.4 km long partly because the alignment constraints imposed by the speed specification required a specific routing. The Chiltern Tunnel, at 16 km, is Britain’s longest rail tunnel — necessitated in part by the inability to take curves through the Chilterns at the required radius.

The ICE review concluded that “politicians’ preferences for world-leading specifications drove costs higher than necessary.” This reflects a pattern common to prestige infrastructure: politicians want to be associated with record-breaking achievements, not optimally-engineered transport solutions. The result, in HS2’s case, is a railway whose specification is genuinely extraordinary — but which has prevented it being built at a cost the country could sustain politically.

Reason 4: Governance Was Structurally Broken

HS2 Ltd — the government-owned company responsible for delivering the project — experienced extraordinary leadership instability. Between 2009 and 2025, the project had multiple chief executives, multiple chairmen, and high rates of turnover across senior leadership. The ICE review found that “without a coherent organisational model to enable continuity,” institutional knowledge was repeatedly lost, relationships with contractors deteriorated, and cost control systems were never fully embedded.

The governance structure placed HS2 Ltd in an arm’s-length relationship with the Department for Transport — theoretically providing delivery autonomy, but in practice creating a gap between political direction and technical delivery. Ministers lacked the technical expertise to challenge HS2 Ltd’s assumptions; HS2 Ltd lacked the political authority to resist ministerial scope additions. The Public Accounts Committee found there was “a lack of technical design oversight to make sure what was being built was value for money.” HMRC is investigating fraud allegations in the supply chain — a consequence, at least partly, of oversight systems that were inadequate to a project of this complexity and scale.

Reason 5: There Was Never a Stable Political Consensus

HS2 was approved under Labour, enthusiastically endorsed by the Coalition, continued under multiple Conservative governments, and then partially cancelled by a Conservative government — before a Labour government confirmed it would not reverse the cancellations. Across 15 years, the project survived six Prime Ministers, nine Transport Secretaries, and multiple spending reviews. Each change of government brought new political priorities, new scope additions or subtractions, and new attempts to use HS2 as a vehicle for whatever regional development narrative was currently fashionable.

Academic research by Cambridge University’s Dan Durrant, published in the Cambridge Journal of Regions, Economy and Society in July 2025, identified HS2’s loss of political support as a narrative collapse: the project was successively used to stand for modernisation, regional levelling-up, decarbonisation, and economic growth — but because it stood for everything, it could be attacked from every direction. When cost overruns became the dominant narrative, there was no single compelling strategic case to counteract it.

The contrast with Spain is illuminating. Spain’s AVE programme has been built by governments of both left and right across 34 years, with consistent political commitment to the long-term programme even when individual lines were questioned. The result is 3,973 km of operational high-speed rail — Europe’s most extensive network — at costs averaging $22 million/km.

Reason 6: Britain’s Planning System Made Costs Structurally Inevitable

HS2’s planning process required a Hybrid Bill — a parliamentary procedure that took over three years and involved parliamentary scrutiny of tens of thousands of individual petitions from affected property owners and communities. This process, while democratically legitimate, has structural consequences for cost. Each petition creates opportunities for scope additions: acoustic barriers, tunnelled sections, habitat mitigation, property compensation. The £100 million bat tunnel — a 1 km structure built to protect a colony of lesser horseshoe bats, costing more than the £73 million railway section it covers — is the most notorious example, but not the only one.

Britain’s land acquisition and compensation regime is also significantly more expensive than continental equivalents. In France, the process of compulsory purchase (expropriation) for HSR corridors is faster and less costly. In Spain, publicly-owned land along potential HSR corridors was reserved decades before construction began. In China, land acquisition that takes a decade in Britain takes months — because land ownership structures and legal frameworks are fundamentally different.

Reason 7: HS2 Was Planned in Isolation, Not as Part of a Network Strategy

Perhaps most fundamentally, HS2 was conceived as a standalone project rather than as part of an integrated national transport strategy. The original case rested primarily on capacity arguments (the West Coast Main Line was approaching saturation) and journey time benefits — but the project was never fully integrated with plans for the wider rail network, for regional connectivity, or for the economic development strategies of the cities it would serve.

When the northern legs were cancelled, there was no plan for how the existing network would provide the capacity relief that HS2 was supposed to deliver. The “Network North” spending announcement that accompanied the cancellation — promising investment in northern rail — was widely criticised as uncosted and insufficiently developed. The ICE review called explicitly for a national transport strategy as a prerequisite for major rail investment decisions: “Infrastructure planning needs to start with outcomes to find the right solutions.”

Europe’s Growing HSR Pipeline — And the Risks Ahead

HS2’s failure has not dampened European HSR ambitions. If anything, the urgency of decarbonisation and the European Commission’s Green Deal targets — doubling HSR traffic by 2030, tripling it by 2050 — have accelerated planning across the continent. The projects currently in development or construction include:

7 Lessons Europe Must Learn from HS2

Lesson 1: Price Honestly from Day One — Even If It Prevents Approval

The most important single lesson from HS2 is that a project approved on a false cost estimate is not really approved — it is a commitment that will be renegotiated, restructured, and possibly cancelled as the real costs emerge. Rail Baltica’s current €17 billion estimate has already been revised upward from earlier projections; the Czech HSR network’s €62 billion figure is almost certainly an underestimate for a programme that has barely started design development.

European governments must resist the temptation to approve HSR projects at the cost that will secure political support rather than the cost that engineering reality demands. The short-term political gain of a lower headline number is far outweighed by the long-term damage of a project that requires repeated resets and cancellations.

Lesson 2: Do Not Award Contracts Before Design Is Mature

The rule is simple: contracts should not be awarded until the design is complete enough that the scope is fixed and the cost is deterministic rather than probabilistic. For complex civil engineering on the scale of HSR, this typically means at least 30–40% detailed design completion before contract award. HS2’s contracts were awarded at approximately 10–15% design development — a level of incompleteness that guaranteed variation claims and cost overruns.

Sweden’s Ostlänken programme, which awarded its first contracts in 2025, has structured its procurement specifically to address this: design development contracts are separated from construction contracts, with the latter awarded only when design is sufficiently mature to support fixed-price competition.

Lesson 3: Establish Genuine Technical Independence

Every major HSR project needs an independent technical oversight body — separate from both the delivery organisation and the sponsoring government department — with the authority and expertise to challenge cost estimates, design decisions, and schedule assumptions. Switzerland’s Federal Office of Transport played this role on the Gotthard Base Tunnel; the absence of any equivalent on HS2 meant that false assumptions were never challenged until they became false realities.

Lesson 4: Build Political Consensus Before Construction, Not During

Spain’s AVE success rests partly on the fact that the strategic case for HSR — connecting Madrid to all major regional capitals, ending Spain’s geographic isolation from the European network — was established and broadly accepted before the first line was built. Subsequent governments inherited a programme with legitimacy, not a contested project they could cancel for political convenience.

Rail Baltica has the advantage of a clear strategic narrative — integrating the Baltic States into Europe and providing military mobility — that commands support across party lines in all three Baltic countries. Lyon–Turin does not: Italian opposition to the project has continued for 30 years. The lesson is that projects without stable political consensus should not advance to construction — because the construction phase will provide opponents with exactly the cost and disruption arguments they need.

Lesson 5: Specify for Transport Need, Not Political Prestige

The question for any HSR project is not “what is the fastest train we can build?” but “what speed reduces journey times enough to shift passengers from air and car, at what cost?” For most European corridors, the answer is 250–300 km/h — not 360 km/h. A railway designed and built for 300 km/h costs materially less per kilometre, requires less land acquisition, and is more compatible with existing infrastructure than one designed for the highest possible speed.

The Czech Republic’s emerging HSR programme should take note: the current specification calls for 300–320 km/h — sensible for the Prague–Brno corridor. Pressure to increase this to 350+ km/h for prestige reasons should be firmly resisted.

Lesson 6: Plan HSR as Network, Not Project

One of HS2’s most damaging characteristics was its isolation from the wider rail network. Stations were planned without integration with local transport; the economic development case was asserted but not operationalised; the relationship between HS2 capacity and capacity on the wider network was only partially modelled.

Rail Baltica, by contrast, is conceived explicitly as a European network project — connecting to Poland, linking to the German and wider EU network, with through-running trains planned from Tallinn to Warsaw and beyond. This network logic makes the strategic case self-sustaining: even if one country’s section is delayed, the overall connectivity benefit remains.

Lesson 7: Accept That HSR Takes Decades — And Plan Accordingly

The Gotthard Base Tunnel took 17 years. The Brenner Base Tunnel, started in 2020, will open around 2032. Rail Baltica will not be fully operational until the 2030s. HS2 Phase 1 — London to Birmingham — will open sometime in the mid-2030s, a quarter of a century after the project was first proposed.

European governments must plan HSR programmes with this timescale explicitly acknowledged. Funding commitments must extend beyond electoral cycles; institutional structures must survive changes of government; technical teams must be retained for decades, not replaced with each ministerial change. The countries that have built HSR successfully — France, Spain, Switzerland, Japan — are those that made the institutional investment to sustain a programme for decades, not those that tried to build a railway in a single political cycle.

What Happens to HS2 Now? The 2026 Status Report

Despite the failures, HS2 Phase 1 is not abandoned. As of February 2026, the project presents a paradoxical picture: deeply troubled governance, but significant physical progress.

• Tunnelling: 85% complete across the Chiltern Tunnel (16 km) and London tunnel sections. The Colne Valley Viaduct — 3.4 km, Britain’s longest railway viaduct in 100 years — is structurally complete.
• Employment: 34,000 workers across 350 active construction sites on the 225 km Phase 1 route.
• Governance reset: Mike Brown (former TfL Commissioner who oversaw the Crossrail recovery) appointed as HS2 Ltd chairman. CEO Mark Wild’s “fundamental reset” targets an assured contractualised baseline by mid-2026.
• Systems integration strategy: A 50-mile “test area” between Birmingham and the Chilterns has been prioritised for early systems integration — modelled on the Crossrail recovery approach that successfully commissioned the Elizabeth Line’s complex central section.
• Euston terminal: Remains unresolved. The government has committed to delivering HS2 trains to Euston but has not identified private funding for the £6bn+ station. Trains may terminate at Old Oak Common for an extended period.
• Opening date: Confirmed to be beyond 2033. Mid-2030s is the current working assumption. No official date has been set.

HS2 vs European HSR: A Structural Comparison

Frequently Asked Questions

1. Why did HS2 fail?

HS2 failed due to a combination of factors: deliberate underestimation of costs at approval stage (what academics call “optimism bias”), premature contract awards before sufficient design development, excessive specification driven by political rather than engineering logic, governance structures with too little technical oversight, high leadership turnover, and Britain’s complex planning system which added cost through years of legal challenges and scope additions. Two independent reviews in 2025 described the project’s management as a “litany of failure.”

2. How much has HS2 cost so far and what is the current estimate?

Over £20 billion has already been spent on HS2. Phase 1 (London to Birmingham) is now estimated to cost between £67–83 billion in 2025 prices, with some forecasts exceeding £100 billion. This compares to an original 2012 estimate of £20.5 billion for Phase 1. The northern legs to Leeds and Manchester were cancelled in 2021 and 2023 at a total preparatory cost of approximately £2.3 billion for the Manchester leg alone.

3. Will HS2 ever open?

Yes. Construction of Phase 1 is well advanced — 85% of tunnelling is complete, 34,000 workers are employed across 350 sites, and major civil structures including the Colne Valley Viaduct are structurally complete. A “fundamental reset” under CEO Mark Wild and new chairman Mike Brown is underway. The opening date is confirmed to be beyond 2033, with mid-2030s the current working assumption for services between Old Oak Common in west London and Birmingham. Whether trains will serve the planned Euston terminal in central London remains unresolved.

4. What can European HSR projects learn from HS2?

Seven key lessons: (1) Provide honest cost estimates from day one; (2) Do not award contracts before design is mature (at least 30–40% complete); (3) Establish genuine independent technical oversight; (4) Build cross-party political consensus before construction begins; (5) Specify for transport need, not political prestige — 300 km/h is usually sufficient; (6) Plan HSR as part of an integrated network, not as a standalone project; (7) Accept that HSR takes decades and create institutional structures that can sustain a programme across multiple electoral cycles.

5. Which European countries have built HSR most successfully?

Spain and France are widely regarded as Europe’s most successful HSR builders. Spain has constructed 3,973 km of high-speed rail since 1992 at average costs of $22 million/km — by far the lowest in Europe — through consistent political commitment across parties and a stable institutional framework under ADIF (the infrastructure manager). France’s TGV network, operational since 1981, has achieved commercial profitability on the Paris–Lyon corridor and has been developed incrementally rather than as a single megaproject. Switzerland’s Gotthard Base Tunnel, while not cheap at $22 billion, was delivered within its long-term projections after a 1992 public referendum locked in 17 years of stable democratic mandate.