Literally had no idea the T was even considering heritage units, let alone actively undertaking the process of doing so at all until I looked up the tail end of this thread just for the heck of it. So needless to say there will be some very pleasantly surprised commuters within the next couple of months
Since #1070 is painted in glossy black as -presumably- the base coat I'd be willing to bet this one is the NYC unit. Sounds like the T is going for the black carbody with a light gray lightning stripe akin to what the Finger Lakes Railway has applied to their locomotives. So imagine the livery on their GP40s but applied to an F40.
RE: the B&M "Bluebird" scheme, by "Bluebird" we are talking about the deep blue carbody with the black cab and white vertical stripes on the ends, correct? AKA the current Mass Central GP-38 scheme?
Disclaimer: I would actually rather that over the "Minuteman" livery even if it used the *non-#4226* McGinnis F-3 look. I think it would look spectacular! And as a side note, that "B+M" logo was clearly an attempt to give the B&M the "Herbert Matter" look. Not the worst thing I've seen, but the regular McGinnis "B&M" "butterfly"(?) logo was perfect IMO. And I sure would not want either that ugly light blue with thin red, white, and blue livery or the 1980s bright blue with bland modern font.
RE: the NH heritage unit... maybe the 1070 *is* the NH unit and is slated to get the Alpert pinstripes with red orange "NH" block logos? AKA the C424/5 look? Or is it more or less confirmed that it is indeed the McGinnis "mustache" livery?
Now seeing as the T appears to be going with the "Minuteman" livery for the B&M unit imagine if the T went with the FA/PA green with gold stripes and the olde script logo for the NH unit?