If this doesn't convince people how impossible it is to protect against people consciously intent on taking their own life and/or killing someone else, then not much will (see this post). Apparently the cause of this death and mayhem was a suicidal individual who placed his car on a railroad track with the intent of killing himself; but then changed his mind at the last minute and exited the car before the train hit it. Unfortunately, the car remained on the track and caused 10 deaths and at least 100 injuries in the subsequent derailment. The accidental suicide murderer is now in custody and will be charged with murder.
Condolences to all who were impacted by this person's behavior.