From: moroney@world.std.spaamtrap.com   
      
   Michael Finfer  writes:   
      
   >If MBTA is a NORAC railroad:   
      
   >Green over red over red:  Clear-proceed   
      
   >Red over flashing green over red:  Limited clear-proceed, limited speed   
   >through interlocking limits   
      
   >Red over red over flashing yellow:  Slow approach-proceed, slow speed   
   >through interlocking limits, approach the next signal prepared to stop.   
      
   Thanks, it appears the Mass. Bay Commuter Rail is part of NORAC. So I know   
   where to look.  Fair amount of freight there as well.   
      
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