positive train control

[Updated below 7/5/16 (6:30 pm)] by Andrea Hricko Last week, three railroad workers were killed in Texas when two BNSF locomotives crashed head-on into each other; one other worker was hospitalized but released. Due to heavy smoke, the bodies of the three workers with fatal injuries were unable to be located for many hours/even several days after the crash because of heavy smoke from the ensuing fire. According to the Wall Street Journal: "The railroad has said that a new safety technology known as positive train control was slated for installation later this year along the area of track…
I heard the headline from CBS News on my car radio: “NTSB to cite operator error in deadly Amtrak derailment.” The news story came on the eve of the National Transportation Safety Board’s (NTSB)  public hearing regarding the May 2015 disaster outside of Philadelphia. The derailment killed eight passengers and injured 200 others. The subsequent news stories repeated "operator error." The phrase makes it sound like the engineer hit the wrong switch or pushed the wrong button. I wondered whether "operator error" in the headlines was a repulsive example of click baiting. It wasn't. The NTSB’s…