The chairman of the NTSB wrote the following for the Phila Inqr:   
      
   Humans can make errors, even on their best days, and PTC provides   
   an extra safety net that slows or stops trains when their operators   
   do not. The National Transportation Safety Board (NTSB) has been   
   urging that railroads explore and implement such technology for   
   more than 45 years.  In 2008, Congress enacted a law that required   
   PTC to be implemented nationwide by Dec. 31, 2015.  Although the   
   2015 deadline would come too late for those who lost their lives   
   or suffered serious injuries in these accidents, at least the law   
   would have enabled us to depend on this life-saving technology   
   coming online by the end of this year.   
      
   for full detailed commentary, please see:   
      
   http://www.philly.com/philly/opinion/20151218_To_save_lives__pus   
   _railroads_to_make_safety_deadline.html   
      
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