From: stephen@sprunk.org   
      
   On 17-Apr-15 21:02, Michael Finfer wrote:   
   > One of the issues here is that SEPTA chose a PTC system that is   
   > incompatible with the one CSX will be using.  I am still shaking my   
   > head over that.  Interoperability was supposed to be one of the key   
   > features of operating a national system.   
      
   There is no "national" PTC system; every railroad is developing their   
   own, and while at least some of them are supposed to be interoperable,   
   in practice that never turns out as well as promised.  We also won't get   
   the benefits of economy of scale that way.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
   K5SSS        dice at every possible opportunity." --Stephen Hawking   
      
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