Bordeaux Train Information: TER Cancellations Due to Heatwave

SNCF suspended all regional express train (TER) services across the Nouvelle-Aquitaine region on June 25, 2026, between 10:00 and 18:00. The railway operator halted traffic due to an extreme heatwave to ensure passenger safety and prevent infrastructure failure caused by high temperatures.

The suspension affected all TER lines within the region during the peak heat hours of the day. SNCF traffic reports indicated that no regional trains operated during this eight-hour window, forcing commuters and travelers to seek alternative transportation.

Why did SNCF suspend TER services?

SNCF cited the “canicule,” or heatwave, as the primary reason for the service stoppage. Extreme heat causes steel rails to undergo thermal expansion. When rails expand beyond their physical tolerances, they can buckle or warp, a condition that creates a high risk of train derailment.

Rail temperatures typically rise higher than the ambient air temperature because the steel absorbs solar radiation. This creates structural stress on the tracks, particularly in open areas with little shade, which are common throughout the Nouvelle-Aquitaine landscape.

How does this differ from standard heat protocols?

The total suspension of services between 10:00 and 18:00 is a more severe measure than SNCF’s standard heatwave response. Under normal heat alerts, the operator typically implements speed restrictions, known as “ralentissements.”

Speed restrictions reduce the kinetic force exerted on the tracks, allowing trains to pass safely over rails that are expanding. The decision to completely halt all TER traffic suggests that temperature forecasts for June 25, 2026, exceeded the safety thresholds where speed reductions alone were sufficient to mitigate the risk of buckling.

What was the impact on Nouvelle-Aquitaine?

The outage disrupted regional connectivity across a wide geographic area, including the hub of Bordeaux and connecting lines to smaller municipalities. By timing the suspension from 10:00 to 18:00, SNCF targeted the window when solar radiation is most intense and rail temperatures reach their peak.

This timing effectively eliminated mid-day regional travel, though it left early morning and late evening windows open for commuters to reach their destinations before the peak heat set in.