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It became the largest marshalling yard in the central Ruhr area and the only station in the Ruhr that included all four forms of rail operations : in addition to its role as a marshalling yard , it was the home depot for over 300 locomotives along with associated rolling stock , a freight yard and a passenger station .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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