From: calvin@remove.daxack.ca   
      
   Nobody (jock@soccer.com) said...   
   >   
   >I've wondered how Yarra Trams in Melbourne handles that situation,   
   >where its system crosses tracks of the region's electrified heavy-rail   
   >network.   
      
   They use an interlocked wiring system called a railway/tramway square.   
   Some photos appear at:   
      
     http://lrt.daxack.ca/Cities/Melbourne/index.html#LevelCrossings   
      
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   Calvin Henry-Cotnam   
   "Unusual or extreme reactions to events caused by negligence   
    are imaginable, but not reasonably foreseeable"   
     - Chief Justice Beverley McLachlin, May 2008   
      
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