Map of the MBTA rapid transit system dating from approximately 1971. It shows the 1971 extension to Quincy, but not the 1973 renaming of Charles to Charles/MGH nor the 1975 Haymarket North Extension. This photograph of the map was taken in MBTA #3400 (A Type 6 mockup never used in regular service) at the Seashore Trolley Museum; the map may be unique.
Massachusetts Bay Transportation Authority
circa 1971-1973
Original image from <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/ekilby/9243117733/lightbox/">flickr</a>; image was cropped to the public domain map.