Boston seems to rival only Washington, DC for old system maps being left in place at stations and on trains. This photo was taken in August of this year, but the map dates from between 2004 to 2008 (the extension of the Silver Line to City Point is the giveaway). I’d probably lean towards the earlier end of that range, due to the “Silver Line Waterfront” designation.
One thing to note is how much cleaner this map looks than the current one: helped a lot by no geography at all, no key bus routes, and interchanges with commuter rail being marked with a neat purple square rather than the entire line.
That’s not to say that the map isn’t without its little quirks, though – the large initial capital letters on the station labels are pretty ugly and the triple asterisk as a footmark notation at Bowdoin station is faintly ridiculous. And the Silver Line still joins onto the loop around Logan Airport the wrong way…
Source: Mr.Konstantin/Flickr