BRETIGNY-SUR-ORGE (France), July 13: The train derailment that killed at least six people in central France on Friday may have been caused by a loose steel plate at a junction, French train operator SNCF said. The steel plate, which should have remained bolted onto the track, moved to “the middle of the track junction”, preventing the rolling stock from passing through, Pierre Izard, head of infrastructure services at SNCF, said on Saturday.

“The reasons why this fishplate dislocated itself is the very focus of the investigations,” SNCF head Guillaume Pepy said, adding the train operator would immediately start checking some 5,000 similar junctions throughout the French rail network.The accident, which injured dozens of people, marred festivities for France's July 14 Bastille Day, traditionally the cue for French families to embark on long summer holidays.

Traffic remained disrupted on Saturday on the central train line linking Paris to Orleans, Limoges and Toulouse, SNCF said.

The Paris-Limoges train, on a regional service that travels more slowly than France's TGV express trains, derailed at the station of Bretigny-sur-Orge, 26 km south of the capital. It was carrying about 385 people, SNCF said.

Workers spent the night cutting through tangled metal, but found no more victims. A crane was brought in to lift a carriage that fell onto its side and others torn open in the accident.—Reuters