From: moroney@world.std.spaamtrap.com   
      
   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.   
      
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