140752
It was built by the Chicago , Rock Island and Pacific railroad in 1903-04 , and was the final tunnel of four to be built on the entire Rock Island railroad , all of which were in Missouri .
 Chicago , Rock Island and Pacific, Rock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chicago , Rock Island and Pacific, Rock