24707
A contactless smartcard solution Bilhete Único ( Unified ticket ) is used for fare collection and control for buses , subway and train ; using the card allows riders discounted prices for multiple rides and makes for easier transitions between transit systems .
 train
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 train