The investigation concluded that staff on Thalys trains, a branch of France's state-run operator SNCF, will receive extra training in dealing with “situations of extreme crisis and danger”.

Some passengers on the Amsterdam to Paris train complained that when staff heard shots fired, most did nothing to assist passengers but instead locked themselves in the engine car.

The gunman was overpowered by two off-duty US servicemen and their friend, whom investigators believe prevented carnage in the incident on August 21st.

The incident saw France propose tough new measures aimed at beefing up train security including increased numbers of armed patrols on the railway network and the possible introduction of bans for individuals from all trains, along the lines of current stadium bans for football hooligans.