關於「Chicago red line」標籤，搜尋引擎有相關的訊息討論：

Red Line (Route info, alerts & schedules) - Chicago Transit Authoritywww.transitchicago.com › redlineCTA Red Line (@CTARedLn) / Twittertwitter.com › ctaredlnCTA Red Line (@RedLineCTA) / Twittertwitter.com › redlinectaWhy Is Chicago's Rail Extension Funding Considered Contro