september.org> 715A7924   
   From: rcp27g@gmail.com   
      
   Jishnu Mukerji  wrote:   
   > 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.   
      
   Interesting, I was under the impression that most locomotives are designed   
   to treat a pantograph reaching the full extent of lift as an indication of   
   a fault of some kind and automatically drop it. I believe a lot of Dutch   
   swing and lifting bridges have no catenary and the pantograph is lowered   
   while the train coasts through.   
      
   Robin   
      
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