In the past , `` Orange Street '' was a connection between the city and the rest of the continent .
`` The Orange Line is so named because it used to run along Orange Street ( now lower Washington Street ) , as the former `` '' Orange Street '' '' also was the street that joined the city to the mainland through Boston Neck in colonial times ; Vintage ( early 1800s ) map of Boston Neck , showing an `` '' Orange Street '' '' running SW to it from peninsular Boston of the 1770s the Green Line because it runs adjacent to parts of the Emerald Necklace park system ; the Blue Line because it runs under Boston Harbor ; and the Red Line because its northernmost station used to be at Harvard University , whose school color is crimson . ''
Massachusetts Bay Transportation Authority