|I love the The Landscape Architect’s Guide to BOSTON.
Unfortunately, this map is missing over a mile of the Southwest Corridor Park.
The park goes 4.7 miles along the Orange line from Forest Hills to Back Bay stations. This map stops short at Ruggles Station.
Here's a link to a map on the park website http://www.swcpc.org/swcpmap.asp?whatsection=A
One book on the corridor claims that the section between the Back Bay and Mass Ave stations is one of the loveliest in the city... check it out!