  haymarket is an mbta subway station serving the green and orange lines, located at the corner of congress and new sudbury streets in downtown boston, massachusetts. haymarket allows transfers between the orange and green lines, as does north station one stop to the north. haymarket was named for haymarket square, which has served as a produce market since around 1830. unusually, the two subway lines that converge at haymarket are not stacked vertically underground, but instead are parallel at approximately the same level. the orange line access consists of two side platforms to serve the line's two tracks, while the green line is served by a single island platform which is divided mostly in half by a wall. passenger transfers between lines require changing levels via stairs or elevator, so it may be preferable to transfer at more-spacious north station, which also allows convenient cross-platform transfers for inbound trips. the station is fully wheelchair accessible.{{cite web |url=http://www.mbta.com/uploadedfiles/accessibi
Financial_District,_Boston Green_Line_(MBTA)_stations Orange_Line_(MBTA)_stations Railway_stations_located_underground_in_Boston,_Massachusetts Railway_stations_opened_in_1898 Railway_stations_opened_in_1908