From: ahk@chinet.com   
      
   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!   
      
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