Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Main was a station on the Chicago Transit Authority's Niles Center branch, now known as the Yellow Line. The station was located at Main Street and Skokie Boulevard in Skokie, Illinois. Main was situated south of Dempster and north of Oakton. Main opened on March 28, 1925, and closed on March 27, 1948, upon the closing of the Niles Center branch. Chicago Transit Authority, also known as CTA, is the operator of mass transit within the City of Chicago, Illinois and some of its surrounding suburbs.