TGV accidents are events involving TGV trains which have harmful consequences, such as injury to people or damage to trains, or derailments. High-speed rail is one of the safest modes of transportation; since service started in 1981, there have only been fatalities in high-speed operation in a 2015 derailment. Today TGV trains accumulate of the order of 50 billion passenger-kilometres per year on lignes à grande vitesse (high-speed lines) alone. 1.2 billion passengers have travelled on the TGV.