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             PHILADELPHIA HEAVY RAIL 
            Two Intersecting Routes, and a Spur  | 
         
       
      
     
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      Philadelphia's heavy rail system consists of 
      two major lines which intersect under downtown, and a spur to one of them.  The Market-Frankford 
      Subway-El runs from 69th St. Terminal west of center city along Market St., 
		first on elevated 
      trackage, and 
      then in subway closer to and under downtown.  It emerges again to the 
		northeast of center city, and ends at the Frankford Transportation 
		Center.  The Broad St. Subway runs mostly below-ground and 
		generally north-south.  Its Ridge Spur branches off to end at 
		8th/Market downtown, to the east of the main line.   
       
      In this view an outbound Market-Frankford train has discharged all of its 
      passengers at the 69th St. Terminal.  Soon the doors will shut, and 
      the train will continue on to turn in a tight-radius loop for the return run.   | 
         
        
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