“ Vehicular tunnels 380.8-971..........Water transportation 380.8-560..........Waterways 561-971..........Shipping 730-943..........Merchant marine. Ocean shipping. Coastwise shipping 1001-5600..........Railroads. Rapid transit systems 5601-5725..........Automotive transportation (Including trucking, bus lines, and taxicab service) 5746-5749..........Stage lines 5751-5870..........Ferries 5880-5990..........Express service 6000-7500..........Postal service. Stamps. ”