From: jishnu@nospam.verizon.net   
      
   On 6/18/2014 10:15 PM, 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.   
   >   
      
   This is easy to handle. Ever seen how they handle the catenary at the   
   Mianus River Bridge on the Northeast Corridor? There is no catenary on   
   the moving section of the bridge. When a train passes it, the pantograph   
   simply extends to full height and it is captured at the other end by a   
   ramp that brings it down to the regular catenary height. All trains that   
   run from New York to New Haven CT, icluding all New York - Boston   
   service, including the Acelas go through this motion on their journey   
   across the Mianus River between Riverside and Cos Cob in Connecticut.   
      
   /J   
      
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