From: stephen@sprunk.org   
      
   On 19-Jun-14 01:23, Glen Labah wrote:   
   > In article , Stephen Sprunk   
   >  wrote:   
   >> On 18-Jun-14 21:15, Glen Labah wrote:   
   >>> Also, in the USA there is the prospect of having an at-grade   
   >>> crossing with a freight line where clearances would not allow   
   >>> overhead.   
   >>   
   >> DART LRT has two at-grade crossings with UP freight lines; the   
   >> wires do go up rather high there, but the pantographs can still   
   >> reach them.   
   >   
   > That's interesting.  SEPTA trolleys crosses a CSX line in at least   
   > one location as well.  What type of clearance do they have though?   
   > Double stack containers or some of the new auto racks are extra-high   
   > clearance, but if they aren't operating those over that line it   
   > wouldn't be a concern.  In certain other places, additional   
   > clearances might be a concern.   
      
   AAR recommends 24ft 3in (7.4m) for 25kV wires over Plate H.  DART LRT is   
   only 750VDC, so their wires might be slightly lower, but it should be in   
   the same ballpark.   
      
   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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