I got this image today from a friend who owns the original Kodachrome. Reweigh date is 1962, so a little past the date of concern for the list. The low lighting shows off the fishbelly sills quite well. The doors are an almost exact match with the MDC/Roundhouse 50' SS double door autocar. The riveted panels of the 4+7 configuration are not evenly spaced left-to-right.
Stay well, everyone,
The 4+7 riveted panels