Robert Sumwalt, who lives in Columbia, often speaks to the media with updates on transportation investigations. Sumwalt worked the accident scene investigation earlier this month of a deadly Amtrak derailment in Philadelphia.
Robert Sumwalt, who lives in Columbia, often speaks to the media with updates on transportation investigations. Sumwalt worked the accident scene investigation earlier this month of a deadly Amtrak derailment in Philadelphia. PROVIDED PHOTO
Robert Sumwalt, who lives in Columbia, often speaks to the media with updates on transportation investigations. Sumwalt worked the accident scene investigation earlier this month of a deadly Amtrak derailment in Philadelphia. PROVIDED PHOTO

Columbia man investigates some of biggest air, train disasters in job with NTSB

May 27, 2015 11:39 AM