Explosive train derailments prompt oil transport concerns

Aired: 4/23/2014 | 0:08:03 | Clip
The amount of oil being moved around the United States by rail has quadrupled since 2005. A string of explosive train derailments in the U.S. and Canada have prompted the National Transportation Safety Board to work with other agencies on improving the safety of the rail shipments. Judy Woodruff talks to Deborah Hersman, chair of the National Transportation Safety Board.