From: spsffan@hotmail.com   
      
   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.   
   >   
   >> 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.   
   >   
   > Here in Chicago, the only flashing light is at a grade crossing. It   
   > indicates to the motorman that the grade crossing signals were activated   
   > but the gate arm hasn't fully lowered yet.   
   >   
   > We had spacer boards; never heard of another rapid transit system   
   > with spacer boards. ATS was railroad style. The cab signals came   
   > from the Westinghouse system built for Cleveland!   
   >   
   > Our railcar dimensions are compatible with New York dimensions... from   
   > the Victorian era!   
   >   
      
      
      
   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.   
      
      
   Thanks for the input guys,   
      
   DAve   
      
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