The National Transportation Safety Board met Tuesday to review and accept the findings of the agency;s probe into the deadly May 2015 Amtrak derailment in Philadelphia that left eight people dead and 200 others hurt.

Here are five key things to know from the board's conclusions about the crash:

1. Caused by distraction: Engineer Brandon Bostian likely lost "situational awareness" and accelerated before the Frankford Junction curve because he was distracted by radio chatter about a SEPTA train hit by rocks.

2. Could have been prevented: The accident wouldn't have happened if Positive Train Control, a system that can slow or stop trains and is commonly known as PTC, had been in place.

3. "Scoop and run" did no harm: The Philadelphia Police Department's practice of transporting people with injuries to hospitals instead of waiting for ambulances led to no "significant negative medical outcomes," though it meant the victims were unevenly distributed at area hospitals. The NTSB said emergency responders need to communicate better.

4. What didn't happen: The safety board ruled out mechanical problems, cell phone use and fatigue as contributing factors.

5. More PTC tragedies ahead?: Amtrak has installed the PTC system on the dangerous Frankford curve, but other progress in the year since the crash has been slow. On the heavily traveled Northeast Corridor, 56 miles still lack PTC and installation has been scant elsewhere. Railroads were supposed to have PTC in place by the end of last year, but now have until at least 2018.