Rouen prosecutor treats a 250-300 kg rail as the lead in the Cléon derailment

A Rouen-Caen regional train derailed at Cléon in Seine-Maritime at about 19:25 on Friday, 11 September. The service carried 186 passengers in two SNCF X 76500 diesel units, numbered 76577 and 76578. One carriage turned on its side. Four others left the rails. Forty-four people were injured. An 18-year-old woman was flown to Rouen University Hospital in a critical condition. Prosecutor Sébastien Gallois said on Saturday that her life was no longer in danger.

Gallois named the object on the track as the leading theory. “At this stage, the leading theory is that a piece of rail was present on one of the tracks, potentially causing the derailment. The reason for its presence is unknown,” he said. Local officials put the fragment at 250 to 300 kilograms. The train’s recording device has been seized. A court-appointed expert has been called. The driver tested negative for drugs and alcohol.

Hervé Morin, president of the Normandy regional council, went further than the prosecutor. He told reporters the most likely scenario was not a casual act but a criminal one. A train had passed the same stretch an hour earlier, he said, and no maintenance work had been done in between. Railway staff on site described a heavy iron bar, believed to be a rail, lying across the line. The locomotive ended up facing Rouen after it had been travelling toward Caen. The line speed there is 120 kilometres an hour. The derailment happened near Renault’s Cléon plant, between Cléon and Tourville-la-Rivière.

About 140 firefighters, five medical teams and 80 vehicles answered the mass-casualty call. Of the lighter injuries, 26 people were treated on Friday night in four Rouen hospitals. Twenty-one went home overnight. Five remained in care. Passenger Louis, speaking to ICI Normandie, described a few jolts and then a stronger movement about three seconds later.

SNCF Réseau cut power and stopped traffic so rescue crews could work. The Bureau d’Enquêtes sur les Accidents de Transport Terrestre has opened its own inquiry, which is the standard technical investigation in French rail accidents. That process is separate from the criminal file in Rouen.

France’s last large derailment in public memory is Brétigny-sur-Orge in July 2013, which killed seven people and was later tied to a track fastening, not to an object placed on the line. Cléon is being treated as a different kind of case because of the weight of the rail and the gap of one hour since the previous train. A 300-kilogram section does not blow onto a running line. Someone moved it, or a works gang left it, and Morin says there was no gang.

What the public does not yet have is a photograph of the fragment in situ released by the prosecutor, a measurement of where it sat relative to the wheels, or a statement from SNCF Réseau on whether any rail had been cut or stored nearby. Those three items will decide if the sabotage label holds. Until they appear, the verified facts are the time, the two unit numbers, the 186 passengers, the 44 injured, the negative toxicology, the seized recorder, and a piece of rail that the region’s president says cannot have arrived by chance.

Monday’s question for the Rouen office is simple. Is the inquiry now a terrorism or criminal-damage case, or does it stay an accident file with a suspicious object? The difference changes who is interviewed and how long the Caen line stays restricted.