Tom,
In "The New Haven Railroad in the McGinnis Era" by Mark J. Frattasio (2003) on page 134 is a photograph of a New Haven Pullman-Standard postwar streamlined stainless steel sheathed passenger car with fluted sides and the red-orange window band with modernized "NH" logo. Part of the caption states: "None of the New Haven's stainless steel sheathed passenger cars escaped getting the new image treatment. All of these cars got the new image colors and logo as a group during the summer of 1955."
I cannot now independently verify the accuracy of this statement and will post in this thread any further information that I find...
MELGAR