On Friday, February 20, 2015 at 1:51:18 PM UTC-5, Joseph D. Korman wrote:   
   > When the NTSB spokesman first talked about the under-running contact   
   > third rail for the MNRR as unique, I said, Philadelphia's   
   > Market-Frankford line has that system too.  Then I realized that the   
   > MFSE line has no public grade crossings.   
      
   "I ride the harlme line" says under-running third rail is newer and superior.    
   But I think it's reversed--overrunning is newer.   
      
   Anyone know for sure?   
      
   iridetheharlemline.com   
      
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