Intermodal shipping is the movement of freight using two or more transportation modes—such as truck, rail, ocean vessel, or air—while keeping the cargo in the same container or similar unit throughout the trip. The handoffs between modes are planned so the goods can move efficiently without repeatedly unpacking and repacking them.
How it works
In a typical international shipment, a truck may pick up a loaded container at a warehouse, a rail line may carry it inland to a port, and an ocean carrier may transport it overseas. A freight forwarder or logistics provider often coordinates the routing, schedules, and documents, while each carrier is responsible only for its own leg of the journey under the contract.
This approach is useful when shippers want a balance of cost, reach, and flexibility. It can reduce cargo handling, help protect sealed freight, and make long-distance moves more practical than using one mode alone. However, the shipper still needs to plan for mode-specific requirements such as container availability, weight limits, booking cutoffs, customs clearance, and transit time differences.
For example, an exporter in the Midwest may load merchandise into a container at its facility, move it by truck to an inland rail terminal, and then send it by rail to a coastal port for ocean export. The shipment may use one bill of lading or multiple transport documents depending on the routing and service structure, so the paperwork should match the carrier arrangement and the importer's customs needs.