World’s 20 Most Expensive Railway Projects Ever Built: The Complete 2026 Ranking

On 12 June 2023, the UK government announced that the northern leg of HS2 — the section linking Birmingham to Manchester — was cancelled. The decision came after the project’s budget had already ballooned from an original £37.5 billion to an estimated £71.7 billion for Phase 1 alone. For infrastructure economists, it was a familiar story: a railway megaproject conceived in optimism, costed in fiction, and delivered — if at all — in a cloud of controversy and cost overruns.

Railway construction has always been expensive. In the Victorian era, railway companies spent the equivalent of billions in modern currency carving routes through mountains and across rivers. But the scale of modern rail investment is unprecedented. Between 2010 and 2026, governments worldwide have committed over $2.5 trillion to railway infrastructure. The 20 projects ranked here represent the apex of that spending — projects where ambition collided with geology, politics, and the inexorable logic of construction economics.

This ranking uses the total project cost in USD at current or most recent official estimates, including all phases where relevant. For completed projects, final outturn costs are used. All figures are nominal (not inflation-adjusted) unless stated, drawn from official government sources, parliamentary committee reports, and verified industry databases.

The 20 Most Expensive Railway Projects Ever Built: Complete Rankings

Project Deep Dives: Engineering, Cost Drivers, and Lessons Learned

#1 — HS2 (High Speed 2), United Kingdom — $137 Billion

HS2 occupies a unique position in the annals of railway construction: it is simultaneously the world’s most expensive railway per kilometre, one of Europe’s most technically ambitious infrastructure projects, and one of the most politically controversial. The project was conceived in 2009 to create a new north-south high-speed corridor linking London, Birmingham, Manchester, and Leeds, reducing journey times and releasing capacity on the congested West Coast Main Line.

The original cost estimate was £37.5 billion for the full network. By 2023, the budget for Phase 1 alone — the 225 km London to Birmingham section — had risen to between £71.7 billion and £98.2 billion. When the northern legs (Phase 2a: Birmingham to Crewe, Phase 2b: Crewe to Manchester) were cancelled in October 2023, the remaining Phase 1 scope was reconfirmed but stripped of its original London terminus at Euston, with trains instead terminating at Old Oak Common in west London.

The engineering specification is extraordinary. The line is designed for 360 km/h operation, requiring curve radii exceeding 7,000 m — demanding massive earthworks, dozens of tunnels, and entirely new civil engineering techniques in Britain. The 16 km Chiltern Tunnel under the environmentally sensitive Chiltern Hills was the largest tunnel boring operation ever undertaken in the UK. The Colne Valley Viaduct — 3.4 km long over a series of lakes — is the longest railway viaduct built in Britain in 100 years. Track specification requires concrete slab track rather than ballasted track on all high-speed sections — a maintenance advantage over decades but a significant upfront cost driver.

The cost per kilometre of approximately $670 million vastly exceeds European norms ($40–80 million/km) for several structural reasons: Britain’s planning system requires lengthy public inquiries and enables extensive legal challenges; land and property compensation in a densely populated country is high; and the specification itself — designed for 360 km/h, with full grade separation, electrification from inception, and passenger safety systems meeting the latest EN standards — reflects lessons from decades of European HSR operation.

#2 — California High-Speed Rail, United States — $126 Billion

California High-Speed Rail (CAHSR) is the most instructive case study in the economics — and politics — of rail megaproject failure. Approved by California voters in November 2008 with Proposition 1A, the project promised a 800 km high-speed rail system connecting San Francisco to Los Angeles in 2 hours 40 minutes, at a total cost of $33 billion, operational by 2028. As of April 2026, the current Phase 1 cost estimate stands at $89–128 billion; the earliest the Merced–Bakersfield Initial Operating Segment will carry passengers is 2033; and the full San Francisco–Los Angeles route has no confirmed completion date.

The project has spent approximately $18 billion, primarily constructing elevated structures and viaducts along a 171-mile corridor in California’s Central Valley — a segment that was chosen partly because its flat terrain would be the easiest to build on, and partly to demonstrate progress. Not a single kilometre of track has been laid as of April 2026. In July 2025, the Trump administration terminated approximately $4.2 billion in federal funding, citing compliance failures including a $7 billion shortfall and the Authority’s failure to procure a trainset vendor after 15 years of planning.

The engineering specification is unimpeachable — CAHSR is designed as a genuine high-speed system: 25 kV AC electrification, full grade separation, 320 km/h maximum speed, and 400-metre trainsets. The failure is one of governance, not engineering. The contrast with China is stark: China built 1,318 km of high-speed rail between Beijing and Shanghai — a far more populous and geologically complex corridor — in just over three years (2008–2011) for approximately $33 billion.

#3 — Chuo Shinkansen (Maglev), Japan — $95 Billion

Japan’s Chuo Shinkansen is the most technically audacious railway project in history: a 438 km superconducting maglev line connecting Tokyo to Osaka via Nagoya, designed for commercial operation at 500 km/h. The project has been in development for over five decades; the current Tokyo–Nagoya section (286 km) is under construction, with the remaining Nagoya–Osaka extension (152 km) delayed indefinitely after the Shizuoka Prefecture refused to grant environmental consent for tunnelling through the Southern Japanese Alps, citing risks to water resources.

The superconducting maglev technology — developed by JR Central over 50 years at the Yamanashi test track — is uniquely demanding. Trains levitate 10 cm above the guideway using onboard superconducting magnets cooled to -269°C with liquid helium, interacting with ground-level propulsion coils to generate forward thrust through linear synchronous motor (LSM) action. The absence of wheel-rail contact eliminates adhesion limits and mechanical wear but requires cryogenic systems, continuous power supply to guideway coils, and entirely new maintenance protocols. The L0 Series test train achieved 603 km/h in April 2015 — the fastest rail vehicle ever recorded. Commercial speed will be 505 km/h.

The total project cost of approximately $95 billion makes Chuo Shinkansen the third most expensive railway project ever undertaken. JR Central has committed to self-funding without government subsidy — a decision of remarkable corporate ambition given the scale — though the Shizuoka dispute has raised serious questions about whether the full Osaka extension will be built this century.

#4 — AVE (Alta Velocidad Española), Spain — $70 Billion+

Spain’s high-speed rail network, the AVE (Alta Velocidad Española), represents the most ambitious national HSR programme in Europe. With over 3,200 km of operational high-speed line by 2026 — the second longest HSR network in the world after China — and a further 1,000 km under construction or in planning, Spain has invested over $70 billion in high-speed rail since the first line opened between Madrid and Seville in 1992. The programme has delivered demonstrable journey time reductions: Madrid–Barcelona in 2 hours 30 minutes, versus 7 hours by conventional rail; Madrid–Seville in 2 hours 30 minutes.

The Spanish approach differs from HS2’s in one critical respect: costs. Spanish HSR construction averages approximately $22 million/km — roughly one-thirtieth of HS2’s per-kilometre cost — largely because Spain builds on relatively unconstrained terrain with lower land compensation costs, a construction industry that has accumulated 30 years of HSR expertise, and a regulatory environment that balances speed of delivery with environmental compliance. The result is a network that has consistently delivered new lines within budget and on time, even if ridership on some thinner routes (notably Madrid–Valladolid) has disappointed projections.

#5 — Grand Paris Express, France — $40 Billion

The Grand Paris Express is Europe’s largest infrastructure project — a 200 km fully automated metro network encircling Paris, connecting the French capital’s suburbs through four new underground lines (Lines 15, 16, 17, and 18) and extensions to existing lines. The project, launched in 2016, is being delivered by Société du Grand Paris (SGP) with a budget of approximately €36 billion ($40 billion), including €8 billion in risk contingency.

The engineering challenge is formidable: 200 km of new tunnels beneath one of Europe’s most geologically complex and archaeologically sensitive cities, much of it below the existing Paris Metro network. Tunnelling must navigate limestone geology, underground aquifers, the famous Paris catacombs, and hundreds of kilometres of existing utility infrastructure. The fully automated, driverless operation (GoA4) requires CBTC signalling from inception, with 68 new stations designed to the highest urban architecture standards. Several stations are being designed by internationally prominent architects — a recognition that the Grand Paris Express is as much a cultural project as a transport one.

#6 — Beijing–Shanghai High Speed Railway, China — $33 Billion

The Beijing–Shanghai High Speed Railway is the benchmark against which all other HSR projects are measured. Built in just over three years (2008–2011), the 1,318 km line carries over 200 million passengers per year and operates at 350 km/h — the highest sustained commercial speed of any steel-wheel railway. Its $33 billion total cost, at approximately $25 million/km, represents the global gold standard for HSR construction efficiency.

The line crosses some of China’s most challenging terrain and densely populated regions, requiring 244 bridges covering 80% of its total length, including the Danyang–Kunshan Grand Bridge — the world’s longest bridge at 164.8 km. The CTCS-3 signalling system provides continuous movement authority via GSM-R radio, with triple-redundant vital processors enabling safe headways of 3 minutes at 350 km/h. In its first decade of operation, the Beijing–Shanghai HSR turned profitable — a rarity among global HSR projects — generating over ¥10 billion ($1.5 billion) in annual net profit by 2019.

#7 — Crossrail / Elizabeth Line, United Kingdom — $25 Billion

Crossrail — rebranded as the Elizabeth Line upon its delayed opening in May 2022 — is Britain’s most recent major railway achievement. The 118 km east-west route through central London, including 42 km of new deep-level tunnel beneath the city, has transformed travel across Greater London, reducing journey times between Paddington and Canary Wharf from 55 minutes to 10 minutes.

The final cost of approximately £18.9 billion ($25 billion) represented a significant overrun from the 2010 approved budget of £14.8 billion — attributed to delays in the complex systems integration phase, particularly the commissioning of the new ETCS-based signalling system in the central tunnel section. The Elizabeth Line now carries approximately 600,000 passengers per day — comparable to the entire Belgian railway network’s daily ridership.

#8 — Lyon–Turin Rail Tunnel (TELT), France/Italy — $26 Billion

The Lyon–Turin Base Tunnel is the centrepiece of a new 270 km high-speed rail corridor linking southeast France with northern Italy. The tunnel section itself — 57.5 km beneath the Alps, making it the second-longest railway tunnel in the world after Gotthard — is currently under construction by TELT (Tunnel Euralpin Lyon Turin), the joint Franco-Italian project company. The $26 billion total project cost covers the tunnel, approach lines on both sides, and associated infrastructure.

The tunnel will eliminate the current rack-and-pinion Fréjus route over the Alps, reducing Paris–Milan journey time from 7 hours to 4 hours and enabling freight to transfer from road (currently 2.5 million heavy trucks per year through Alpine passes) to rail. Critics — particularly in Italy, where the No-TAV movement has organised sustained protests since the 1990s — argue that the cost cannot be justified by traffic projections. Supporters cite carbon reduction targets and EU cohesion policy. Construction of the main bore began in 2022; completion is expected around 2032.

#9 — Gotthard Base Tunnel, Switzerland — $22 Billion

The Gotthard Base Tunnel is the engineering triumph against which all tunnel projects are measured. At 57.1 km, it is the world’s longest railway tunnel — and at CHF 23 billion ($22 billion for a 57 km structure), among the most expensive per kilometre of completed tunnel ever built. Construction took 17 years: drilling began in 1999, and the first passenger train ran in June 2016.

The tunnel runs beneath 2,300 m of Alpine rock, in geological conditions that presented constant challenges: fractured granite, mixed geology, extreme water pressure (up to 100 bar), and temperatures inside the tunnel rock face reaching 46°C. Four separate excavation faces worked simultaneously, requiring precise coordination to ensure that the two parallel single-track bores aligned within millimetre tolerance at the breakthrough points. The tunnel allows trains to traverse the Alps at near-sea-level, eliminating the 27 km Gotthard mountain route with its steep gradients, curves, and decades-old infrastructure. Journey time from Zurich to Lugano fell from 3 hours 30 minutes to 2 hours 10 minutes — a testament to what precision engineering and Swiss financing can achieve.

#10 — Riyadh Metro, Saudi Arabia — $22.5 Billion

The Riyadh Metro is the largest urban rail project ever undertaken in a single contract. Launched in 2014 with six lines covering 176 km and 85 stations, the $22.5 billion project was delivered by four international consortia simultaneously — an approach that created extraordinary coordination challenges but enabled parallel construction on all six lines. The metro opened to passengers in December 2024 after a series of delays, becoming the first metro system in Saudi Arabia.

The engineering challenge was primarily one of desert geology and extreme heat: Riyadh’s summer temperatures exceed 45°C, requiring that all stations be fully air-conditioned and that rolling stock be designed for ambient temperatures up to 55°C. The metro uses Bombardier Innovia driverless technology (GoA4) across all lines, with CBTC signalling providing 90-second headways during peak hours. The project is a cornerstone of Saudi Vision 2030’s transport diversification strategy.

#11 — New York East Side Access, USA — $12 Billion (3.2 km)

East Side Access occupies a singular position in the history of railway construction: with a final cost of approximately $12 billion for a 3.2 km tunnel extension connecting Long Island Rail Road (LIRR) to a new concourse beneath Grand Central Madison station on Manhattan’s East Side, its per-kilometre cost of approximately $3.75 billion/km makes it the most expensive per-kilometre railway structure ever built. The project, originally budgeted at $4.3 billion in 2006, opened in January 2023 — eight years late and nearly three times over budget.

The overrun reflects the extraordinary complexity of tunnelling beneath one of the world’s most densely built urban environments. Workers excavated through Manhattan schist, tunnelled beneath existing subway lines, utility corridors, and building foundations, and carved out a cavernous 50-metre-deep station beneath an already complex transit hub. Union labour costs and regulatory requirements in New York are the highest of any construction market globally. The MTA’s institutional capacity — or lack thereof — to manage megaprojects has been the subject of extensive academic study, most notably the Transit Costs Project at New York University, which found that New York’s rail construction costs are 5–10 times higher than comparable projects in Europe and Asia.

#12 — Mumbai–Ahmedabad High Speed Rail, India — $14 Billion

India’s first high-speed railway — a 508 km Shinkansen-technology line connecting Mumbai to Ahmedabad, India’s commercial and cultural capitals of western India — is under construction with Japanese financial and technical assistance. The $14 billion project, funded approximately 80% by a ¥1.5 trillion JICA loan at 0.1% interest, will run Shinkansen E5-derived rolling stock at up to 320 km/h, reducing the Mumbai–Ahmedabad journey from 7 hours by conventional rail to under 3 hours.

The project has faced significant challenges: land acquisition in the Mumbai Metropolitan Region proved politically contentious, delaying the start of construction by three years. The 21 km undersea tunnel beneath Thane Creek — the first undersea rail tunnel in India — required specialist boring equipment and marine geotechnical surveys of unprecedented complexity. The revised completion target for the full line is 2028, with a partial section between Surat and Bilimora targeted for 2027.

#13 — Sydney Metro Network, Australia — $22 Billion+

Sydney’s Metro programme — comprising Metro Northwest (2019), Metro City & Southwest (2024), and Metro West (under construction) — represents Australia’s largest public infrastructure investment. The network, when complete, will deliver over 113 km of driverless metro rail across greater Sydney at a combined cost exceeding $22 billion. Metro West alone — a 24 km tunnel connecting the CBD to Parramatta — carries a cost estimate of $18–25 billion, making it one of the most expensive urban rail projects globally on a per-kilometre basis.

#14 — Etihad Rail, United Arab Emirates — $11 Billion

Etihad Rail is the UAE’s national freight and passenger railway — a 1,200 km network connecting the seven Emirates and linking to GCC rail networks in Saudi Arabia and Oman. The $11 billion project, initiated in 2009, has been delivered in stages, with freight operations between Abu Dhabi and Dubai operational since 2016. Passenger services commenced limited operations in 2024, with full network completion expected by 2028. The engineering challenge was one of extreme desert conditions: temperature variations from 2°C in winter to 50°C in summer, frequent sandstorms reducing visibility to zero, and saline groundwater conditions requiring specialist track foundations.

#15 — Channel Tunnel, France/UK — $21 Billion (Inflation-Adjusted)

The Channel Tunnel — the 50.5 km undersea rail link between Folkestone and Coquelles, opened in 1994 — was the defining infrastructure achievement of the twentieth century. Its original cost of £4.65 billion (1994 prices) has risen to approximately $21 billion in 2024 values. The project was delivered by Eurotunnel (now Getlink) as a private concession without government capital funding — a financing model that proved financially catastrophic for early investors, with Eurotunnel requiring multiple debt restructurings before achieving operational profitability in the 2010s.

The tunnel consists of three bores: two 7.6-metre-diameter single-track rail tunnels and a central 4.8-metre service tunnel connecting them. At its deepest point, the tunnel runs 75 m below the seabed, through Chalk Marl — a geological formation specifically chosen for its impermeability and workability. Eleven tunnel boring machines (TBMs) were used simultaneously; the UK and French machines met at the undersea breakthrough point in December 1990, within 358 mm of alignment — one of the most precise civil engineering achievements in history.

#16–20: The Remaining Megaprojects

Brenner Base Tunnel (#16, $9.8bn): A 55 km tunnel beneath the Alps connecting Innsbruck (Austria) to Fortezza (Italy), due for completion in 2032. The tunnel will enable 400-metre freight trains — eliminating the Brenner Pass road, through which 14 million trucks per year currently travel.

Fehmarnbelt Fixed Link (#17, $10.5bn): An 18 km immersed tube tunnel beneath the Baltic Sea connecting Denmark and Germany, currently under construction. When completed in 2029, it will be the world’s longest combined road and rail immersed tunnel, reducing Copenhagen–Hamburg journey time from 5 hours to 2 hours 40 minutes.

Jakarta–Bandung High Speed Rail, Indonesia (#18, $8bn): The WHOOSH (Whoosh Operasional Segera High Speed), opened in October 2023, is Southeast Asia’s first high-speed railway — a 142 km Chinese-built line connecting Jakarta and Bandung in 40 minutes. Despite opening delays and cost overruns from the original $6bn budget, WHOOSH demonstrates that HSR is achievable in a developing country context when backed by Chinese financing, construction expertise, and technology transfer.

Rail Baltica (#19, $17bn): A 870 km European standard-gauge railway connecting Tallinn (Estonia), Riga (Latvia), and Vilnius (Lithuania) to Warsaw — integrating the Baltic States into the European rail network and providing strategic military mobility. Funded by EU Connecting Europe Facility, the project is under construction across all three countries simultaneously, with completion targeted for 2030.

Melbourne Airport Rail Link (#20, $8bn): A 27 km rail link connecting Melbourne’s CBD to Melbourne Airport — Australia’s busiest airport, the only major airport in a developed country without a rail connection until now. Under construction, with opening targeted for 2029. The $296 million/km cost reflects tunnelling beneath dense suburban Melbourne, station construction at the airport complex, and Australian labour costs.

What the Rankings Reveal: The Economics of Railway Megaprojects

Cost Per Kilometre: The Most Important Metric Nobody Discusses

Total project cost is a misleading comparator: HS2 ($137bn) and the Beijing–Shanghai HSR ($33bn) are both enormous sums, but HS2 covers 225 km while Beijing–Shanghai covers 1,318 km. The cost per kilometre reveals the true structural differences:

Why Do Cost Overruns Happen? The Systematic Causes

Research by Professor Bent Flyvbjerg at Oxford’s Saïd Business School — analysing 258 transport megaprojects over 70 years — identified the consistent mechanisms behind railway cost overruns:

Optimism Bias: Project promoters systematically underestimate costs and overestimate benefits to secure political approval — what Flyvbjerg calls “survival of the unfittest” in the planning process. California HSR’s $33 billion estimate was never realistic; the promoters knew this but required a number that would pass a voter referendum.

Strategic Misrepresentation: Deliberately presenting misleading cost estimates to secure funding. Once a project has begun construction, sunk cost psychology makes cancellation politically impossible even as costs escalate.

Scope Creep: HS2’s original specification was revised multiple times, adding features — enhanced station designs, upgraded noise mitigation, expanded tunnelling — that each seemed reasonable individually but collectively doubled the cost.

Geological Surprise: Tunnelling in particular is subject to geological conditions that cannot be fully characterised before excavation begins. The Gotthard Base Tunnel encountered multiple unexpected geological formations requiring changes in boring technique and schedule.

Political Interference: The most cost-effective routing is rarely the politically optimal routing. Stations are added to serve politically important constituencies; routes are adjusted to avoid influential landowners; environmental requirements are added mid-construction.

Case Studies: When Railway Projects Succeed — and When They Fail

• Beijing–Shanghai HSR (Success): Built on time, within 10% of budget, profitable within a decade. Key factors: single decision-making authority, state capacity for land acquisition, established domestic construction industry, clear political mandate with no scope changes.
• California HSR (Failure): The inverse of Beijing–Shanghai in every respect. Multiple authorities with conflicting mandates, complex legal challenges from landowners and environmental groups, scope changes driven by political rather than engineering logic, and a funding structure that was never sufficient for the stated ambition.
• Crossrail (Partial Success): Opened two years late and significantly over budget, but operational and carrying near-projected ridership. The delay was primarily in systems integration — the ETCS signalling commissioning — rather than civil construction, which was largely on time and budget.
• Gotthard Base Tunnel (Engineering Success): A 17-year project that finished within its long-term cost projections. Switzerland’s direct democracy required a 1992 public referendum to approve the project — but once approved, political support was consistent for two decades.
• East Side Access (Governance Failure): The costliest per-km rail project in history is not explained by geology or specification alone, but by New York’s fragmented labour markets, regulatory complexity, and a construction management culture that the Transit Costs Project described as “uniquely dysfunctional.”

Frequently Asked Questions

1. What is the most expensive railway project ever built?

HS2 in the United Kingdom holds the record as the most expensive railway project ever built by total cost, with the full project estimated at $137 billion (£108 billion). On a cost-per-kilometre basis, New York’s East Side Access is the most expensive at approximately $3.75 billion per kilometre for its 3.2 km extension.

2. Why do railway projects cost so much more in some countries than others?

The cost differential between countries reflects several structural factors: labour costs and union agreements (New York union labour costs are estimated to be 3–5× higher than equivalent European rates); land acquisition and compensation systems (compulsory purchase in the UK is significantly more expensive than in France or Spain); regulatory complexity and the number of approvals required; geological conditions; specification standards (seismic design in Japan adds 20–30% to costs); and the presence or absence of a domestic construction industry with HSR experience. China’s low costs ($15–25 million/km) reflect all these factors operating favourably: low labour costs relative to output, fast land acquisition, streamlined planning, flat terrain on many corridors, and an industry that has built 50,000 km of HSR.

3. Which railway project has had the worst cost overrun in history?

California High-Speed Rail has the worst cost overrun of any railway project in history by absolute percentage: approved at $33 billion in 2008, the current estimate of $89–128 billion for Phase 1 represents an overrun of 270–388%. In absolute dollar terms, HS2’s overrun from £37.5 billion to over £100 billion for a reduced scope is larger. New York’s East Side Access overran by 280% ($4.3bn to $12bn), but is now operational.

4. Are expensive railway projects worth the investment?

The evidence is mixed and highly context-dependent. The Beijing–Shanghai HSR is profitable and transformed mobility between China’s two largest cities — demonstrably worth its $33 billion investment. The Gotthard Base Tunnel dramatically reduced Switzerland’s freight dependence on Alpine road transport. Conversely, California HSR — if completed — will serve a corridor already well-served by air travel, in a car-dependent state where rail modal share is below 1%. HS2 will provide significant capacity benefits on Britain’s busiest rail corridor, but at a cost that could have funded a national fibre broadband rollout, significant social housing construction, or multiple new hospitals. The economic case for any railway project depends critically on the counterfactual: what else could the money have built?

5. How does China build high-speed rail so cheaply compared to Western countries?

China’s HSR cost advantage is structural, not superficial. Key factors: (1) Labour costs — Chinese construction wages, while rising, remain 60–80% lower than European equivalents; (2) Land acquisition — China’s public ownership of land means that acquisition is faster and compensation lower than in countries with strong private property rights; (3) Scale economies — having built 50,000 km of HSR, China’s construction industry has accumulated expertise, standardised designs, and supply chain efficiencies unavailable in countries building their first HSR line; (4) Streamlined planning — environmental and planning approvals that take 10 years in the UK can be completed in 2–3 years in China; (5) Competition — China’s large domestic market for HSR construction supports multiple competing contractors, keeping prices lower than in markets served by a single national champion. Critics note that Chinese HSR costs exclude some external costs (displacement of residents, environmental mitigation) that Western projects must account for — and that the debt accumulated to finance China’s rail expansion represents a future liability of extraordinary scale.