Heat‑Driven Catenary Rupture Leaves Two TGVs Stranded North of Lyon

Overview

• A catenary wire snapped near Montanay on Monday, May 25, cutting electrical supply and immobilizing two TGVs on the Paris–Lyon–Marseille–Nice axis so that on‑board air conditioning stopped.
• Hundreds of travellers were allowed to leave stalled carriages onto the trackside to get air while protection civile, gendarmes and firefighters supplied water and medical support.
• The stoppage forced many trains onto slower classic lines and produced delays ranging from about 30 minutes to roughly seven or eight hours on key Paris‑to‑Marseille and Paris‑to‑Nice services.
• SNCF has opened an investigation to determine the cause of the rupture, is offering exceptional compensation to affected passengers, and has cancelled selected mid‑day Intercités departures on May 28–29 to avoid further AC failures on older Corail rolling stock.
• Experts say high temperatures increase catenary dilation and electrical stress, that TGV backup batteries cannot power full air conditioning when stopped, and that network resilience will require substantial technical upgrades and investment including trains with larger batteries.