324401
Originally steam , later diesel locomotives brought trains , particularly coal from the Nottinghamshire coalfield to the down sidings , where the motive power was changed to electric traction for the run over Woodhead to Mottram yard where it was changed again for steam ( later diesel ) to continue its journey .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None