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On April 28 , 1973 , 18 boxcars loaded with bombs en route to the Concord Naval Weapons Station began detonating in the Southern Pacific Railroad yard after one of the cars caught fire .
 location: Concord Naval Weapons Station; organization: Southern Pacific Railroad
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Concord Naval Weapons Station; organization: Southern Pacific Railroad