Accident involving at least one rail vehicle in motion, resulting in at least one killed or seriously injured person, or in significant damage to stock, track, other installations or the environment (damage that exceeds an internationally agreed threshold), or extensive disruptions to traffic. Accidents in workshops, warehouses and depots are excluded.
Note: This definition is used by the International Union of Railways. The threshold for significant damage, adopted by the International Union of Railways, was set at EUR 150 000 in 2007.