Here is a nice, lightly used example of the New York Central System square window caboose, item number 6-36553 and carrying road number 21.  A beautiful red caboose with black, red and white lettering.  Lighted.  Photos show the caboose from all 6 sides, with a yardstick in the shots for size reference.   Priced fairly, with only actual USPS Ground Advantage or Priority Mail shipping cost charged to the winner!