From: wb8foz@panix.com   
      
   "The sense and braking unit (SBU) is a device placed on the   
   rear of the train and is connected to the train brake pipe. The   
   SBU senses train movement, monitors brake pipe pressure, and   
   sends the information to the locomotive, where it is displayed   
   in the cab. The SBU can also be used to initiate an emergency   
   brake application from the end of the train.  The SBU data   
   from MMA-002 were downloaded (Engineering Laboratory Report   
   LP132/2013). "   
      
   How different is this from a FRED?   
   Are the logs stored in the SBU or the cab?   
      
      
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