The TGV Atlantique is a class of high-speed trains used in France by SNCF; they were built by Alstom between 1988 and 1992, and were the second generation of TGV trains, following on from the TGV Sud-Est trainsets. From Wikipedia
SNCF says checks cleared the line after a train hit a piece of metal near Massy, with operations adjusted to bypass the area.
