CNN Anderson Cooper 360 May 14, 2015 03:12:00
Going too fast. they had dead man switches on the train and all this discussion about a positive train control, this is actually a warning system through a series of transponders that would communicate about two to three miles apart to a receiver on the locomotive if the information being communitycated to the train if they were going too fast for instance 106 in a 50 mile-per-hour zone, then a buzzer would go off, alerting the engineer and he would take action and if he didn't then the computers on board, would actually slow it down, so you would have an audible warning system. the irony is t...
Source: archive.org