From: stephen@sprunk.org   
      
   On 02-Jan-16 01:46, spsfman wrote:   
   > On 1/1/2016 12:34 PM, Adam H. Kerman wrote:   
   >> Stephen Sprunk  wrote:   
   >>> 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.   
   >>> ...   
   >>   
   >> Here in Chicago, the only flashing light is at a grade crossing.   
   >> ...   
   >   
   > It isn't for a grade crossing, but it quite possibly could be for a   
   > diverging track. The tracks are elevated and grade separated where I   
   > saw the signal. But just ahead, the tracks go to grade and pass the   
   > now being completed maintenance yard. While the yard is on the left,   
   > I think there is also a siding on the right in the vicinity and just   
   > past the yards. So it rather makes sense.   
      
   Sounds like this is coming west from Expo/Bundy Station; the yard is on   
   the left after the line returns to grade, but according to the FEIR, the   
   two mains are on the far right and the only siding (a yard lead, plus   
   the yard itself) is on the left.  I don't see anything in the plans that   
   would indicate a crossover or other interlocking involvement on the   
   right track, but since the left track does and thus needs a two-headed   
   signal, they may have given the right the same for consistency.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
   K5SSS        dice at every possible opportunity." --Stephen Hawking   
      
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