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The latter half of 1950 and early 1951 saw the testing of new EM1 electric locomotives for use over the Woodhead Line between Manchester and Sheffield .
 Woodhead Line, Manchester, Sheffield
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Woodhead Line, Manchester, Sheffield