Engineer's Speed Prior to Deadly Amtrak Crash Remains Puzzle

  • NTSB investigation yields little evidence of mechanical glitch
  • Agency to determine formal probable cause later this year

The engineer operating an Amtrak train that derailed in Philadelphia last year pushed its throttle to full, increasing the train’s speed to 106 miles per hour, before entering a sharp curve, according to documents released by the National Transportation Safety Board Monday.

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