Porter is an MBTA transfer station serving the rapid transit Red Line and the commuter rail Fitchburg Line, located at Porter Square in Cambridge, Massachusetts. Positioned at the intersection of Massachusetts Avenue and Somerville Avenue, the station provides rapid transit access to northern Cambridge and the western portions of Somerville. Porter is 14 minutes from Park Street on the Red Line, and about 10 minutes from North Station on commuter rail trains. Several local MBTA Bus routes also stop at the station.