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He left before he had completed his three years to help his father survey the Stockton and Darlington Railway .
 location: Stockton and Darlington Railway
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Stockton and Darlington Railway 
Answer:
 location: Stockton and Darlington Railway