PHILADELPHIA — It was one of the biggest disasters in recent city history: A speeding Amtrak train careened off the tracks and crashed in Philadelphia’s Frankford neighborhood in 2015, killing eight people and injuring more than 200. In the years since, Amtrak has agreed to pay more than a quarter-billion dollars to settle lawsuits with victims. The railroad was also ordered to install preventive safety measures along the Northeast Corridor. And the National Transportation Safety Board conducted a yearlong probe of the cause, finding that engineer Brandon Bostian — who survived — likely lost h…