Rail suicide or suicide by train is deliberate self-harm resulting in death by means of a moving rail vehicle. The suicide occurs when an approaching train hits a suicidal pedestrian jumping onto, lying down on, or wandering or standing on the tracks. Low friction on the tracks usually makes it impossible for the train to stop quickly enough. On urban mass transit rail systems that use a high-voltage electrified third rail, the suicide may also touch or be otherwise drawn into contact with it, adding electrocution to the cause of death.