You have to get people behind it, you can't just go fix it yourself (as in it's far too involved, not that you wouldn't be allowed to try). Trust me! If you could 3274 would be up and running by now! Find the right people to talk to about 3127, I would certainly support that (meaning help you with it) project! There is a lot of knowledge out there in regards to the basic PCC and all electrics as well. The Picture Window cars have rapid transit controllers like the 01100 Orange Line cars and are far more complicated to work on. I'm going way off topic here, so I will digress.
ck4049, If you want to work on a PCC, I encourage it, I just don't want you starting off thinking you'll have it running in a month and then get discouraged and give up on it. Definitely use this Boston Day as a reason to tell people, "hey look! we need this thing to run!" and hopefully we will get the support from others needed to get the job done. I strongly feel that 3127 should be the target for this effort, as it is the best mechanically (or should be). I really feel we should have at least one of each type up and running. Maybe for Boston day 2015 we'll have 3019 (Tremont Car), 3127 (Wartime), 3221(All Electric), 3274 (Picture Window), and 3340 (Ex Dallas). Hey, I can dream!
As far as 3221's location I believe its in either the Fairview or Fairview-west yard (unless it's been moved, there's been A LOT of shifting in the past few months and a lot of stuff got scrambled, I'll bring myself up to speed in the spring). It could be the other tarped car in Bennet though, I might be mixing them up. The other 2 cars over there thought are 2026 (flatcar) and 3292 (Picture Window).
(Further discussion of specific cars and where they are should probably be diverted to a thread of its own over in the Museums forum.)
End point being that it is very unlikely (nearly certain) that a Boston PCC will not be in operation for Boston Day 2010, but if there is enough of a push behind it, it is certainly a possibility for 2011!