From: HAL@hal.invalid   
      
   In article , Robert   
   Heller  wrote:   
      
   > A single head red   
   > (simple block signal) is stop and proceed at reduced speed, expecting to stop   
   > when catching up with a train ahead.   
      
   Under NORAC, red color block signals with a number plate are stop and   
   proceeds. No matter the number of heads.   
      
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