From: cfmpublic@ns.sympatico.ca   
      
   On Mon, 20 Apr 2015 09:50:31 -0500, Stephen Sprunk   
    wrote:   
      
   >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.   
      
   Guess what, they are having the same problem with ETCS and its various   
   levels in Europe.  Read Modern Railways (Ian Allen in Britain) and   
   Today's Rail Europe.   
      
   CLark Morris   
   >   
   >S   
      
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