MBTA System Maps

At Felicitas Publica, some articles about changes to the MBTA subway system in Boston over the last 40 years:

The New England Transportation Site has some historical system maps, as well. And the Wikipedia entry on the T looks jam-packed with information as well.

The Images of America series of books (which I enjoy a lot) has a couple of volumes on urban rail lines in Boston: Boston in Motion (I think I might own this one), Trolleys Under the Hub and Boston’s Blue Line.