The MTL part #'s are 031 00 072, 073, 074, 075 and 076. The road #'s are C&O 21299, 21463, 21294, 21457 and 21494. Which are 50' Single Door, Standard Boxcars for the Chesapeake and Ohio Cameo Schemes Cars. The build date is 5-56. There is also a date of WAL 6-56 on the cars. These cars were Intended to promote Chessie's less-than-carload service. There were six cars in the series. Five of the cars had different paint schemes per sides. These are the five cars.