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      Some of the buildings in 
      Edinburgh have changed little over the years.  However, examining the 
      transport on the streets can often give a fairly precise date of when a 
      photograph was taken, as well as giving a particular character to scene. 
      Princes Street: 
       
      
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      -  Horse-drawn trams ran 
      1871-1907 
      -  Cable cars ran 1899-1922 
      -  Electric trams ran 1922-1956 
        
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