Operating Era: 1918-1959. Atlantic Coast Line, Atlantic Coast Dispatch. THIS SERIES NOW COMES WITH OUR ONE-PIECE ROOF FRAME. Atlantic Coast Dispatch was a joint venture of Atlantic Coast Line and Pennsylvania, formed in 1887. It was not a separate company but a name given to expedited freight service. ACL owned the cars lettered for ACD. Most were 36' DS cars but the O-15 was the exception. Based on the USRA DS box car design, its 7-8 end is generally referred to as the later clone design. ACL requested ventilated side doors and three-fin closeable end vents for the cars. Upon delivery in 1921 the cars came painted yellow with maroon and white herald. In 1929 the colors were changed to oxide red with white herald. The cars were rebuilt about 1936 with larger opening in the ventilated door and were given AB brakes a few years later. In 1947 the Gothic lettering came into use and in 1954 ACL replaced ACD in the herald and prismo lettering was added. Some cars received an alternate door roller arrangement.