Alpine rail tunnel hits 50km milestone

Fifty kilometres of tunnel now run beneath the Alps. Boring machines have carved through rock 600 metres below the surface, between France and Italy, on what is the longest cross-border rail project Europe has ever attempted. The Lyon-Turin base tunnel involves some 164 km of total underground works, roughly €11 billion committed to the cross-border section, and three decades of political argument (Xataka). At this depth and this cost, too much money is buried in Alpine rock to stop digging. But buried money is not proof that the project works.

The promise and the missing ledger

The EU backs Lyon-Turin through TEN-T (the Trans-European Transport Network, which treats Europe's transport links as one continental grid rather than 27 separate national ones). The logic: national governments underinvest in cross-border infrastructure because costs fall locally while benefits flow to several countries. The EU's dedicated transport-funding instrument exists for projects that pass this test of "European added value," meaning the project benefits Europe as a whole more than any single country could justify paying for alone (CEF Regulation 2021/1153, CEF Transport).

The tunnel promises to cut the Lyon-Turin passenger journey from roughly 3 hours 20 minutes to about 2 hours, and to give freight a rail alternative to lorries crossing Alpine valleys (Xataka). No current public document reconciles total cost, the financing split between France, Italy, and the EU, traffic forecasts, and carbon accounting.

French MPs Gabriel Amard and Jean-François Coulomme have demanded detailed past and future financing accounts from the transport minister and have not received them (Le Progrès). Le Monde has reported tunnelling delays and damage to fragile water sources in Savoie (Le Monde). Project critics cite a broader figure closer to €16.1 billion when national access lines, inflation, and past spending are included (Enviscope). The gap between €11 billion and €16.1 billion is the difference between asking what the tunnel costs and what the whole corridor costs.

The Brenner warning: a tunnel is not a freight route

The Brenner Base Tunnel between Austria and Italy is the closest test case. It promises 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% year-on-year (neue.at). Lorry traffic keeps growing while the tunnel is still being built.

A tunnel creates capacity. Getting freight off roads and onto rail requires something else: rail has to beat the truck on price, speed, and reliability, and the access lines, terminals, and signalling at both ends have to actually function (VerkehrsRundschau). Germany's Brenner approach line alone carries an estimated €8.57 billion price tag plus a €7.6 billion risk buffer, with completion not expected until the early 2040s (schiene.de). Approach lines can cost nearly as much as the tunnel itself, and their delays can trap an expensive tunnel between capacity that exists and a corridor that doesn't.

Who bears the cost before Europe gets a benefit

Lyon-Turin sits on the Mediterranean Corridor, a TEN-T route running from southeastern Spain through France into Italy. Spanish exporters could eventually rail goods toward northern Italy. But Spain's own section is only 36% in service, according to the business coalition #QuieroCorredor (Europa Press). A tunnel under the Alps means nothing to a Valencia shipper if the track to the French border doesn't work.

Alpine communities bear the immediate costs: noise, construction disruption, strained water sources, all arriving long before any continent-wide freight benefit (meinbezirk.at). The European Court of Auditors has found that big EU transport projects often arrive late, cost more than promised, and deliver less traffic than forecast (ECA).

Lyon-Turin may beat the pattern. But 50 km of tunnel is not a functioning corridor. The economic case still depends on access lines, competitive rail pricing, and honest traffic forecasts. None of those have been proven, and 50 km of sunk cost is not a substitute for proving them.