This industry comprises establishments primarily engaged in the merchant wholesale distribution of transportation equipment and supplies (except marine pleasure craft and motor vehicles). Illustrative Examples: Aircraft merchant wholesalers Railroad cars merchant wholesalers Motorized passenger golf carts merchant wholesalers Ships merchant wholesalers Cross-References. Establishments primarily engaged in-- ? Merchant wholesale distribution of motor vehicles and motor vehicle parts--are classified in Industry Group 4231, Motor Vehicle and Motor Vehicle Parts and Supplies Merchant Wholesalers; and ? Merchant wholesale distribution of marine pleasure craft--are classified in Industry 423910, Sporting and Recreational Goods and Supplies Merchant Wholesalers.