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The Royal Bavarian State Railways ' sole class " S 2 / 6 " steam locomotive was built in 1906 by the firm of Maffei in Munich , Germany .
 Royal Bavarian State Railways, Maffei, Munich, Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Bavarian State Railways, Maffei, Munich, Germany