France’s SNCF limits regional trains in Grand Est to air-conditioned cars through Monday amid heat wave

France’s national rail operator, SNCF, is restricting service in the Grand Est region to trains equipped with air conditioning as extreme heat grips the area—an operational move aimed at preventing passengers from being stuck in overheated railcars.

The measure took effect Thursday, June 18, with non-air-conditioned trainsets pulled from service in Grand Est until at least Monday, according to the report. SNCF’s stated goal is to reduce the risk of travelers becoming confined in sweltering cars and suffering heat-related illness.

SNCF says 99% of its TER regional trains are air-conditioned, but that figure only helps if enough cooled trainsets are available to cover scheduled runs. When part of the fleet is unavailable—or when high temperatures raise the risk of air-conditioning failures—SNCF has opted to concentrate service on trains considered reliable.

Heat-related disruptions have spread beyond Grand Est

The Grand Est restrictions come as SNCF has faced broader heat-driven disruptions on national routes. In late May, the company canceled Intercités departures linking Paris with the Southwest and on the Bordeaux-to-Marseille corridor, citing the risk of air-conditioning breakdowns on Corail trainsets.

In total, 71 Intercités trains were canceled over a window running from Thursday through the following Monday, the report said.

To soften the impact, SNCF increased capacity on some remaining trains by adding cars when technically possible. “These temporary reductions target midday trains,” the company said, adding that “all affected customers have been contacted again since the beginning of the week to allow them to reorganize their trip.”

The limits of the strategy were highlighted by an incident in which a TGV was stuck for several hours during a heat wave without air conditioning, forcing passengers to get off and seek shade alongside the train.

Source : L’Est Républicain, La Dépêche du Midi

How SNCF says it protects passengers during extreme heat

Beyond cancelations, SNCF has rolled out a set of measures intended to keep riders safe during extreme temperatures. The company calibrates onboard air conditioning to avoid a sharp temperature shock: when it’s 33°C (about 91°F) outside, the air inside cars is not set below 26°C (about 79°F).

On the equipment side, some cars have been fitted with heat-blocking (athermic) filters to reduce heat penetration. SNCF has also painted the roofs of some Intercités, TER and Transilien rolling stock white to reflect sunlight. If air conditioning fails, a phone support line is available to the onboard conductor to help resolve the problem quickly before it drags on.

Real-time communication is another tool SNCF says it relies on, committing to share information “as early as possible and on all available channels” including social media, websites, SMS and email.

Chaleur extrême et trains : les failles du réseau

Flotte sous tension

Les rames Corail des Intercités, conçues avant les canicules actuelles, saturent à la chaleur. La SNCF préfère supprimer des trains plutôt que risquer des pannes en service.

Offre réduite en pic de demande

Filtrer la circulation selon l'équipement climatique diminue l'offre exactement quand les voyageurs en ont le plus besoin.

Voyageurs recontactés

La SNCF s'engage à prévenir tous les clients concernés par SMS, e-mail ou sur ses canaux en ligne pour leur permettre de réorganiser leur voyage.

Innovations anti-chaleur

Filtres athermiques, toits peints en blanc et assistance téléphonique en cas de panne : la SNCF a engagé des adaptations matérielles, mais leur déploiement reste partiel.

Grand Est en première ligne

La région est la première à voir sa circulation TER restreinte aux seules rames climatisées lors de cet épisode de juin 2026.

An aging fleet faces growing stress from hotter summers

The repeat disruptions point to a structural strain for SNCF. Corail trainsets used on Intercités routes date from a period when heat waves of today’s intensity were less common, and their air-conditioning systems—designed for less extreme temperatures—can become overwhelmed during peak heat.

In Grand Est, limiting service to air-conditioned trains is presented as a pragmatic short-term response. It lowers the risk of breakdowns in service, but it also reduces the number of trains available at the moment travelers may need them most. A return to normal operations depends on the end of the heat wave, the report said.