This sector comprises establishments primarily engaged in transporting passengers and goods, warehousing and storing goods, and providing services to these establishments. The modes of transportation are road (trucking, public transit, and ground passenger), rail, water, air, and pipeline. These are further subdivided according to the way in which businesses in each mode organize their establishments. National post office and courier establishments, which also transport goods, are included in this sector. Warehousing and storage establishments are subdivided according to the type of service and facility that is operated. Many of the establishments in this sector are structured as networks, with activities, workers, and physical facilities distributed over an extensive geographic area. Establishments primarily engaged in renting and leasing transportation equipment without an operator are not included in this sector.