Saw a photo of "The Comet" in Back Bay station the other day. Looked like it might have been some kind of Zephre type of unit? Never heard of it. Did the New Haven or B&A run it and was it similar to the Flying Yankee in design?
Yep, it was a pioneering high speed lightweight train that the New Haven Railroad ran between Boston and Providence starting in 1935, although not really a twin of the B&M's Flying Yankee. You can find a whole lot more info at this link:
http://www.nhrhta.org/htdocs/images1001.htm