On Saturday, March 5, 2016 at 1:19:30 PM UTC-5, Stephen Sprunk wrote:   
      
   > Multi-/single-head is orthogonal to home/distant/block.   
      
   FWIW, when CSX resignaled a line in the 1990s, they used single triangle   
   heads for block signals and they added a blinking yellow aspect.   
   When they recently redid this same line, they used double vertical   
   head (some call it the 'Darth Vader' signal).  What used to be a simple   
   green is now a green over red.  The new signal has a number plate, but to   
   my surprise it is tiny.   
      
   --- SoupGate/W32 v1.03   
    * Origin: LiveWire BBS -=*=- UseNet FTN Gateway (1:2320/1)