Stephen Sprunk wrote:   
   > A mini high block requires bridge plates if it's not going to conflict   
   > with freight trains, and that slows boarding--and unpredictably so,   
   > which is worse.   
      
   If the vast majority of trains are passenger trains (or freight trains that   
   clear high platforms), and a wide freight is a rarity, they can leave the   
   flip-down high platform edges deployed most of the time, and only retract them   
   before a freight comes    
   through.   
      
   Jimmy   
      
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