Further clarification on the window band colors:
On page 90 of "The New Haven's Streamline Passenger Fleet 1934-1953," by Geoffrey Doughty, referring to the "Postwar Pullmans," he states: "...very few made it into Amtrak Service."
On pages 113 and 114, Doughty shows photos (taken in 1967 and '68) of two sleeping cars in the "Beach" series with unpainted window bands. On page 120, he states that under Penn Central "many of the postwar stainless steel cars" ... received ... "a green stripe where the McGinnis red-orange had been in the window section of the car."
On page 538 of "New Haven Power 1838-1968" by Alvin Stauffer, the author shows a photo of one of the 27 "Point" series sleepers and states that they were the "only New Haven sleepers with a painted window band that was olive green as built but repainted red-orange under the McGinnis administration."
So, that is the window band color story as best I can ascertain it.