Dewey Square is a square in downtown Boston, Massachusetts which lies at the intersection of Atlantic Avenue, Summer Street, Federal Street, Purchase Street and the John F. Kennedy Surface Road, with the Central Artery (I-93) passing underneath in the Dewey Square Tunnel, which was built in the Big Dig. South Station is on the southeast corner of the square, with Amtrak and MBTA Commuter Rail services, as well as Red Line subway trains and Silver Line bus rapid transit underneath.