Some flipping through "New England Diesels" by Dave Albert and George Melvin seems to reveal the following patterns: The post-FT maroon-and-gold cab units, including the 3800s, and the pre-blue switchers and road-switchers had "BOSTON AND MAINE" along the sides with "AND" being about half the size of the other words. Post-FT maroon-and-gold cabs had Minuteman heralds on the nose, while pre-blue switchers and road-switchers generally had heralds on the cab sides. Exceptions? Yep!
Historical accuracy, as in many public-relations exercises, has been a casualty. Pre-builder-blue road-switchers carried four-digit numbers, the first two indicating approximate horse-power. 15XX for 1500 HP, approximately, allowing for 1600-HP RS-2s and RS-3s, and 17XX for 1750-HP GP-9s, so "77" is newly-created history, as is the paint job.
"A gray crossover is definitely not company transportation."