Hi Ted,
My first thought when I read the subject line of the thread was that you were referring to SR&RL
engine 21, i.e. Eustis No. 8! That was scrapped back in 1936...
My understanding is the same as Glenn's, that SR&RL coach 21 (originally Franklin & Megantic coach 2) is currently at Boothbay Railway Village and that it was the last piece of original Maine Two-Foot equipment to leave Edaville and was never part of the Maine NG collection in Portland. (I heard someone say Boothbay acquired the car in trade for some shop work they did for Edaville, but I don't know that for a fact.) I recall that Stewart Rhine posted some recent pictures of the car on the WW&F Facebook page a few months ago, so the car definitely still exists!
-Philip Marshall