From: ahk@chinet.com   
      
   hancock4@bbs.cpcn.com wrote:   
      
   >Would anyone know the specific indication of the following signal:   
      
   >At an interlocking, a flashing green light over a red light.   
      
   >Thanks.   
      
   CSX uses flashing green to indicate "approach medium", but it's used in   
   red over yellow over flashing green.   
      
   Could you give me a hint as to what railroad and which interlocking?   
      
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