From: stephen@sprunk.org   
      
   On 01-Jan-16 02:32, spsfman wrote:   
   > I saw a flashing green over red on the not open for business yet   
   > Phase II Expo Line here in Los Angeles. This is light rail, and they   
   > began running test trains in November. I saw the signal last week.   
   >   
   > It was on the right hand track, which would be the usual direction   
   > of travel. The left track had red over red. This is the first signal   
   > after leaving a station, if that means anything.   
      
   Assuming this was at an interlocking, green (flashing or not) over red   
   sounds like an IRT-style signal, where the upper head is the speed for   
   the main route and the lower head is the speed for the diverging route;   
   at least one of them is always red.  I've never seen flashing green on   
   such a system, though, only flashing yellow.   
      
   This can't be a BMT/IND-style signal, where the upper head shows the   
   speed and the lower head shows the route; neither can be red unless both   
   are red.   
      
   Of course, LACMTA could have come up with a unique signal system, but   
   most light/heavy rail systems have copied one of NYC's two because   
   they're well understood and proven.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
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