On Monday, April 4, 2016 at 10:24:23 PM UTC-4, John Albert wrote:   
      
   > Hard to say at this point.   
      
   In the previous very similar accident about 20 years ago, they   
   said MOW vehicles were purposely set up NOT to shunt track   
   circuits.  This was because such units didn't always shunt, so   
   it was felt it was best to assume they didn't.  Thus, such a vehicle   
   wouldn't trip the signals.   
      
   Is this still true?   
      
   It seems to me they should've gone the opposite way--put something   
   on the vehicles to ensure they do shunt the signal circuits and   
   create occupancy.   
      
   (ABC News got it wrong--they said the signals check for speed   
   but not obstructions.)   
      
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