From: finfer@optonline.net   
      
   On 4/8/2016 2:34 PM, Michael Moroney wrote:   
   > What are the set of signal indications used on MBTA-owned lines in   
   > Massachusetts?  I'm a little curious because they replaced a bridge signal   
   > with a wayside signal which happens to be right in the field of view when   
   > I am at a traffic light I pass daily on my way to work.  So it's there   
   > saying "Notice Me!".   
   >   
   > Usually both sides are red over red over red (stop and stay), other   
   > indications I've seen are green/red/red, red/flashing green/red (while a   
   > single engine was passing it, it then turned all red), and   
   > red/red/flashing yellow. I believe this is an interlock home signal not a   
   > block signal.   
   >   
      
   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.   
      
   --   
   Michael Finfer   
   Bridgewater, NJ   
      
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