CFL to halt all trains between Luxembourg and Thionville for five weeks this summer

For five weeks this summer, the single most-travelled railway line into Luxembourg will fall silent. From Thursday 16 July to Sunday 23 August 2026, no trains at all will run between Luxembourg and Thionville — and on to Metz — while the national railway, the CFL, rebuilds a stretch of the track. Replacement buses will take their place. For the tens of thousands of French cross-border workers who ride that line every working day, it means a longer, less predictable commute for the better part of the holidays.

The CFL confirmed the shutdown on Wednesday 2 July as part of a wider summer maintenance programme spread across five of its lines. The company argues that scheduling the heaviest works during the school holidays limits the damage, because passenger numbers dip when schools are out. That is cold comfort for the commuters who keep going to work through July and August.

Why this line matters most

No other rail corridor carries as much of Luxembourg's imported workforce. Roughly 120,000 people commute in from France — the largest of the three frontalier groups in a labour market where cross-border workers make up close to half of all salaried jobs — and about half of them live in and around Thionville. On a normal day the line runs some 60 trains, with a journey time of little more than twenty minutes at its fastest. Peak-hour services are routinely packed.

Swapping that capacity for road transport is not a like-for-like exchange. Buses are slower, more exposed to motorway congestion around the capital, and cannot match the throughput of a train at rush hour. The CFL is laying on a dense replacement network — buses linking Metz, Thionville, the park-and-ride hubs at Bettembourg and Howald, and Luxembourg station — but travellers should plan for the connection between train and bus to add time to the trip.

The CFL says the works were deliberately timed for the school holidays, when passenger numbers on the network are at their lowest.

What is being rebuilt

The closure is not routine patching. Across 2026 the CFL is renewing around 30 kilometres of track, laying tens of thousands of new sleepers and moving comparable tonnages of ballast. The summer campaign includes 11.4 kilometres of renewed track between Wecker and Fausermillen and further renewal work on the Northern line. On the German border, the Wasserbillig railway bridge is being rebuilt jointly with Germany's infrastructure manager, DB InfraGO.

The Thionville axis is only one piece. Over the same holiday window the CFL is also interrupting or thinning service on the lines toward Esch-sur-Alzette and Rodange, toward Ettelbruck, Troisvierges and Gouvy, and toward Kleinbettingen and the Belgian border at Arlon. To handle it all, the railway is deploying around 200 drivers running close to a thousand replacement bus journeys a day across the network at peak.

No fast train to Paris either

The disruption reaches beyond commuters. The high-speed TGV link between Luxembourg and France is suspended for a large part of the summer, cutting the direct fast connection to Paris during the peak travel weeks. Anyone booked on that service will need to check for rerouting well in advance.

The pain is meant to buy something. The works feed into projects the CFL has been building toward for years: the new Howald interchange is due to open in the final quarter of 2026, and a rebuilt Luxembourg–Bettembourg line — the spine of the southern network — is scheduled to enter service in September 2027. Once those are in place, the line that is closing this summer should carry more trains, more reliably.

Planning around it

For now, the practical advice is straightforward. Commuters and holiday travellers on the affected routes should consult the CFL's annual works calendar and mobile app, allow extra time for bus legs and interchanges, and check bookings on cross-border and high-speed services before travelling. The detailed replacement timetables are published ahead of each work phase.

• No trains Luxembourg–Thionville–Metz: 16 July to 23 August 2026.
• Replacement buses via Metz, Thionville, Bettembourg, Howald and Luxembourg station.
• TGV Luxembourg–Paris suspended for much of the summer.
• Four other CFL lines also affected across the school holidays.