2486
The  Pennsylvania Railroad  's class R1 comprised a single prototype electric locomotive constructed in 1934 by the Baldwin Locomotive Works of  Philadelphia Pennsylvania  USA with the electrical equipment by Westinghouse .
 city of headquarters: Pennsylvania Railroad, Philadelphia Pennsylvania
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 city of headquarters: Pennsylvania Railroad, Philadelphia Pennsylvania