Seaboard System Railroad, recognized by its SBD reporting mark, was formed in the 1980s as a holding company uniting several southeastern railroads, including Seaboard Coast Line and related lines, to streamline freight operations across the Southeast. Seaboard System trains for sale often feature diesel locomotives, freight equipment, and railroad models tied to the transitional era leading into the formation of modern CSX operations.
SBD locomotive models and freight rolling stock remain popular with collectors and model railroaders building 1980s freight consists, southeastern rail corridors, and modern diesel-era layouts. These railroad models are commonly added to model trains focused on contemporary freight railroading and regional railroad mergers.