Charles/MGH Station also known as Charles or Charles Street, is located above Charles Circle, at the intersection of Cambridge Street and Charles Street, in Boston, Massachusetts. The rapid transit station is on the MBTA Red Line and is elevated, being located at the Boston end of the Longfellow Bridge, which carries the subway and vehicular traffic across the Charles River. Trains enter or exit a tunnel just southeast of the station. The station is one of the few on the Red Line that have no bus connections.