Alpine tunnel reaches 50km

There are now 50 kilometres of tunnel under the Alps, carved through rock up to 600 metres beneath the surface between France and Italy. It is part of the Lyon-Turin base tunnel, the largest cross-border rail project Europe has tried to build: about 164 km of underground works, roughly €11 billion committed to the cross-border section, and three decades of argument before the boring machines got this far (Xataka).

At this stage, too much money has been buried in Alpine rock for anyone in Paris, Rome or Brussels to treat the project as reversible. But sunk cost is not an economic case. The real question is whether the tunnel becomes a working freight corridor, or merely an impressive piece of engineering waiting for the rest of Europe to catch up.

The promise and the missing ledger

The EU supports Lyon-Turin through TEN-T, the Trans-European Transport Network. That is Brussels' attempt to treat Europe's transport system as a continental grid rather than a patchwork of national projects. The reasoning is sound enough: governments tend to underinvest in cross-border links because the disruption and spending fall at home, while the gains are spread across neighbours.

That is why the EU has a dedicated transport-funding instrument for projects with "European added value". In plain English, the project must benefit Europe as a whole more than any one country could justify paying for by itself (CEF Regulation 2021/1153, CEF Transport).

Lyon-Turin promises to cut the passenger journey between the two cities from about 3 hours 20 minutes to roughly 2 hours. For freight, the pitch is more important: rail capacity that could take lorries out of Alpine valleys and move goods between France and Italy with lower emissions (Xataka).

What is still missing is the full ledger. There is no current public document that pulls together the total cost, the split between France, Italy and the EU, the traffic forecasts and the carbon accounting in one place.

French MPs Gabriel Amard and Jean-François Coulomme have asked the transport minister for detailed accounts of past and future financing. They have not received them (Le Progrès). Le Monde has reported delays in tunnelling and damage to fragile water sources in Savoie (Le Monde).

Critics put the wider bill closer to €16.1 billion once national access lines, inflation and past spending are included (Enviscope). That difference matters. €11 billion is the cost of the cross-border tunnel section. €16.1 billion asks the harder question: what does the whole corridor actually cost?

The Brenner warning: a tunnel is not a freight route

The Brenner Base Tunnel between Austria and Italy offers the nearest warning. It is meant to cut freight transit from about 105 minutes to 35 minutes (BBT SE). Yet in the first half of 2026, 1.26 million lorries crossed the Brenner route, up 3.57% on the year (neue.at).

That does not mean the Brenner tunnel has failed before it opens. It means the problem is larger than the hole through the mountain.

A tunnel creates capacity. It does not, by itself, move freight from road to rail. Rail has to beat the truck on price, speed and reliability. The approach lines, terminals and signalling at both ends must work in practice, not just in corridor maps (VerkehrsRundschau).

Germany's Brenner approach line alone carries an estimated €8.57 billion cost, plus a €7.6 billion risk buffer, with completion not expected until the early 2040s (schiene.de). Approach lines can end up costing nearly as much as the tunnel itself. If they arrive late, an expensive tunnel is left suspended between physical capacity and a corridor that cannot yet use it.

Who bears the cost before Europe gets a benefit

Lyon-Turin sits on the Mediterranean Corridor, the TEN-T route running from southeastern Spain through France and into Italy. In theory, Spanish exporters could one day send goods by rail towards northern Italy. In practice, Spain's own section is only 36% in service, according to the business coalition #QuieroCorredor (Europa Press).

For a shipper in Valencia, a tunnel under the Alps is of little use if the track to the French border is not working properly. That is the awkward truth about European infrastructure: the benefit is only continental when the weak sections are fixed as well as the showcase ones.

The costs, meanwhile, are local long before the gains are European. Alpine communities get the noise, disruption and pressure on water sources now. The promise of cleaner freight flows comes later, if the wider system performs (meinbezirk.at).

The European Court of Auditors has found that major EU transport projects often arrive late, cost more than promised and carry less traffic than forecast (ECA). Lyon-Turin may yet avoid that pattern. It might become the missing Alpine link its backers describe.

But 50 km of tunnel is not a functioning corridor. The case still rests on access lines, competitive rail pricing and traffic forecasts that can survive scrutiny. None of that has been proven by the milestone underground. A long tunnel is an engineering achievement. It is not, on its own, proof that the economics will work.