The Phila Inqr ran some detailed articles, including detailed   
   sketches, of the problems in the SL5 trucks.  They also   
   explain about who did the actual defective welding and what   
   is planned to repair the defective bar.   
      
   http://www.philly.com/philly/business/transportation/20160720_Ma   
   er_of_SEPTA_rail_cars_blames_cracks_on_flawed_weld.html   
      
   http://www.philly.com/philly/business/transportation/20160725_STRESS_TESTS.html   
      
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