I don't see how they could, unless PAR has recently lifted their ban on six-axle units east of Northern Maine Junction.
It was mentioned somewhere else (can't remember where I saw it) that they might break this train into two or three smaller trains at Waterville so that PAR and NBSR will be able to handle it the rest of the way with their own four-axle power. I don't know if that's fact or just speculation, but it would make a lot of sense.
MEC407
Moderator:
Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
Central Maine & Quebec/Montreal, Maine & Atlantic/Bangor & Aroostook
Providence & Worcester — New England — GE Locomotives