This new rolling stock was either converted from existing boxcars or built from scratch based on Association of American Railroads standard 50'-6" single-sheathed steel boxcar designs, and were constructed entirely out of steel with heavily reinforced ends. In some instances baggage cars were converted into temporary kitchen cars before ACF could complete its order. The cars were painted the standard Pullman Green and affixed with gold lettering. Along the Atchison, Topeka and Santa Fe Railway's "Surf Line," trains consisting of 10-12 former Southern Pacific interurban trailer cars, owned by the U.S. Maritime Commission but bearing Santa Fe markings, were fitted with conventional knuckle couplers at each end of the trainset and pressed into service to handle the additional passenger loads.