39614
The Ring Rail Line serves Helsinki Airport and northern suburbs of Vantaa and is exclusively used by the commuter rail network .
 Ring Rail Line, Helsinki Airport, Vantaa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ring Rail Line, Helsinki Airport, Vantaa