The original ACL Atlantic Coast Despatch paint scheme (yellow ochre body, boxcar red & white herald, black lettering, boxcar red trim) was officially dropped in 1929 in favor of the more cost effective brown with white lettering.  The attached photo of Rich Yoders O-scale O-17 model shows the pre-1929 paint scheme.   The pre-29 paint scheme was also applied to ACL subsidiary roads such as the Washington & Vandermere (with ACD herald) and the Winston-Salem Southbound Rwy (sans ACD herald).  The ACL also modified 50 class O-12 vents for express service. The cars (Nos. 1800-1849) were painted Pullman dark green and lettered in white.  The 0-12s were returned to the freight service with the conversion of the 50 USRA DS rebuilds (1850-1899).  Hope this helps.