To me the Santa Fe ATSF Ribbed 2-Bay Covered Hopper looks like the Greenville Steel Car Co. car, but the builder's logo was painted over. Chicago & NorthWestern had Greenville Steel Car Co. 2-Bay Covered Hoppers that were built in 1980-1981 which where the same design as the ATSF cars shown.
Walthers made a compromise by putting the ATSF and C&NW schemes on the Pullman-Standard Ribbed 2-bay Covered Hoppers that had noticably higher sides and taller hoppers when viewed together.
Andrew
Falcon Service