Oak Grove is a rapid transit station on the MBTA Orange Line, located in the northern part of Malden, Massachusetts just south of the Melrose border. The northern terminus of the Orange Line, Oak Grove has a 788-space park and ride lot serving nearby residential communities. It is also served by four MBTA Bus routes and has secure cages for bicycle storage. Oak Grove has a single platform for the Haverhill Line that passes through the station.