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In 1901 , William Barclay Parsons , chief engineer for the New York Rapid Transit Commission , had traveled to Boston with Christopher Lafarge , where he was apparently inspired by the ornamental houses he saw used as entrances on the Tremont Street Subway .
 William Barclay Parsons, Boston, Christopher Lafarge, Subway
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William Barclay Parsons, Boston, Christopher Lafarge, Subway