6422
Until 2004 the line hosted several Inland Route Regional trains which continued east from Springfield along the CSX Transportation ( former  Boston and Albany Railroad  ) line to  Boston  Massachusetts .
 city of headquarters: Boston and Albany Railroad, Boston
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:  Boston and Albany Railroad, Boston 
Answer:
 city of headquarters: Boston and Albany Railroad, Boston