BobbyD: Believe the Central Vermont 2-10-4's remained black throughout their careers. Canadian National's earliest 4-8-4's wore gray boilers, 1926-1930. CN and GTW U4 streamlined 4-8-4's, CN 4-6-4's and CN U1f "Bullet Nose Betty" 4-8-2's were either all green or portions were green. CV 2-10-4 #700 carried the name "Norwich University" above it's cab number for a period of time.
#707 made the last run of a CV 2-10-4 on 03-23-57, on northbound second #491. #707 would be my preferred version, as it had the flat smoke box front which, to my perspective, comes off best.