From: gl4317@yahoo.com   
      
   In article ,   
    Marc Van Dyck  wrote:   
      
   > A second possible usage is at crossings between different transit   
   > systems, for example a tram line and a trolleybus line.   
      
      
   There are a number of different possibilities.  Among them extended   
   operation to places where it isn't worth using overhead.  As an example,   
   a branch of the Portland Streetcar to Willamette Park could be possible   
   as a line already exists as an out of service ex-freight line.  However,   
   the ridership at first would be far too low to make electrification   
   worthwhile.  Something able to operate off a battery for that relatively   
   short distance could provide hourly service or such until the line is   
   worth electrification.   
      
   Also, in the USA there is the prospect of having an at-grade crossing   
   with a freight line where clearances would not allow overhead.   
      
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