Green Line "D" Branch

The "D" Branch, also known as the Highland Branch or the Riverside Line, is a portion of the Massachusetts Bay Transportation Authority Green Line, a light rail network in metropolitan Boston, Massachusetts and the suburbs to the west. It branches off near Kenmore Square from the Tremont Street Subway and Boylston Street subway from downtown shared with the other light rail lines. It then continues west for about ten miles on a private surface right of way, grade separated from roads and highways, formerly the Highland Branch of the Boston and Albany Railroad. The right of way is double tracked throughout without express tracks.
As of 2014, the downtown terminus is at the Park Street station during rush hours, and at North Station during other times; from time to time the Riverside Line had continued an additional mile to the Lechmere terminal in East Cambridge. Free transfer is provided to the rapid transit lines and other light rail lines (the "B" Branch...