On Wednesday, June 18, 2014 6:00:19 PM UTC-4, Marc Van Dyck wrote:   
      
   > A second possible usage is at crossings between different transit   
   > systems, for example a tram line and a trolleybus line.   
      
   Yes, the article mentioned that situation specifically, and gave Portland as   
   an example.   
      
   Of course, long ago they managed to have complex overhead where a trolley and   
   trackless line crossed or turned a corner:  (Wyoming Ave, Rts 47, 50, and 75,   
   Phila)   
      
   http://www.nycsubway.org/perl/show?13454   
      
   http://www.nycsubway.org/perl/show?13546   
      
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