Ironically the Los Angeles light rail system has had two major fatal crashes in the past 5 or 6 years.  One incident where a person parked their SUV on the tracks, purportedly to kill themself, then fled the car at last minute, train crashed killing like 20 people.  Then just last year a train operator was text messaging with some train-enthusiast kids he had befriended, ran a series of red lights and crashed the train, killing 5-10 people if I recall correctly.

But, you know, they should fear criminals and terrorists in train stations.