315
He served as vice president of the  Chicago  Rock Island and Pacific Railroad and was a director of the  Chicago and Eastern Illinois Railroad  and the Delaware and Hudson Canal Company .
 city of headquarters: Chicago, Chicago and Eastern Illinois Railroad
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Chicago, Chicago and Eastern Illinois Railroad 
Answer:
 city of headquarters: Chicago, Chicago and Eastern Illinois Railroad