The Orange Line is one of the four subway lines of the MBTA. It extends from Forest Hills in Jamaica Plain, Boston in the south to Oak Grove in Malden, Massachusetts in the north. It meets the Red Line at Downtown Crossing, the Blue Line at State, and the Green Line at Haymarket and North Station. It connects with Amtrak and Commuter Rail service at Back Bay and North Station, and just the commuter rail at Ruggles station in Roxbury.