From: ahk@chinet.com   
      
   David Lesher  wrote:   
      
   >"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?   
      
   The report referred to logs in the device itself.   
      
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