This industry comprises establishments primarily engaged in operating railroads (except street railroads, commuter rail, urban rapid transit, and scenic and sightseeing trains). Line-haul railroads and short line railroads are included in this industry. Cross-References. Establishments primarily engaged in-- ? Operating street railroads, commuter rail, and urban rapid transit systems--are classified in Industry Group 4851, Urban Transit Systems; ? Operating scenic and sightseeing trains--are classified in Industry 48711, Scenic and Sightseeing Transportation, Land; and ? Operating switching and terminal facilities as separate establishments--are classified in Industry 48821, Support Activities for Rail Transportation.