As service on Amtrak's critical Boston-to-DC Northeast Corridor returns to normal today, questions remain over the violent derailment of train 188 in Philadelphia last week that left several dead and dozens injured. Triple-digit speeds were reported nearing a curve with a speed limit of just 50, which seems likely to have contributed to the accident — but some sort of object had apparently hit another train along the route, and the NTSB has "not ruled out" the possibility of objects hitting 188 as well.
Still, speed has remained a central focus of the investigation, which has turned the focus to PTC — Positive Train Control, an established technology in the rail industry that uses a system of signals, computers, and GPS to prevent...
Former Amtrak CEO: railway was 'moving as fast as it could' to implement safety controls
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