During WW II, gasoline and tires were tightly rationed and most people   
   depended on public transportation to get to work.  Due to the war effort,   
   absence from work was greatly discouraged.   
      
   In Philadelphia, a major war materiel production center, the transit workers   
   staged a wildcat strike on account of the recruitment of African American   
   motorman and conductors; previously those positions were all white.  This   
   caused a major disruption in    
   the city.   
      
   http://en.wikipedia.org/wiki/Philadelphia_transit_strike_of_1944   
      
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