Intermodal Transportation with TMS: End-to-End Planning

Intermodal transportation moves a load by more than one mode inside the same unit, such as a container, trailer or swap body, without the unit being opened. The load reaches the port by road, crosses the sea by ship, travels inland by rail and completes the last mile by road again.

It is often confused with multimodal transportation. Both use more than one mode, and the difference is mostly contractual. In multimodal transport the whole journey runs under a single contract of carriage, while in intermodal transport each leg may have its own contract and its own carrier.

The intermodal model stands out on long distances, with regular volumes and with loads that have some flexibility on transit time. Running the main leg by rail or sea lowers the unit cost, and road is used only for the first and last mile.

It also offers an alternative when driver and vehicle capacity is tight, or on lanes where waiting times at border crossings have grown. For very urgent, short-distance loads, on the other hand, transfer times can cancel out the advantage.

The difficulty is not in the individual legs but in the places where they connect. A vessel arriving late can mean a missed rail connection, which can move the delivery by several days. Each leg sets the starting conditions for the next.

On top of that, every mode has its own document, its own terminology and its own carrier. Sea freight uses the bill of lading, rail the CIM consignment note and road the CMR. When the information is spread across different systems, seeing the file as a whole becomes hard.

Transfer points sit at the centre of intermodal planning: ports, rail terminals and transshipment hubs. For the plan to be realistic it has to account for handling times, cut-off times and connection schedules at these points.

The buffer placed between legs is a balance. Too short, and a small delay breaks the whole chain. Too long, and total transit time grows for no reason. Having past shipments on record lets that buffer be set from actual figures rather than from estimates.

As a load passes from one carrier to the next, liability changes hands as well. In a case of damage or loss, what decides where liability sits is the record of each handover and of the condition of the unit at that moment.

For this reason the documents for every leg need to be kept under the same file, and the details need to agree from one leg to the next. Carrying fields such as container number, seal number and weight correctly from one document to another prevents disputes later.

The cost of an intermodal shipment is made up of many items: pre-carriage, main-leg freight, terminal handling charges, storage, demurrage and on-carriage. These arrive from different carriers, in different currencies and at different times.

When they are tracked separately, the real profitability of a shipment is known only after the job is finished. Bringing every charge together under one shipment makes it possible to quote accurately and to notice unexpected costs early.

Tracking for each leg comes from a different source. The customer, however, cares about when the load will be delivered, not about the legs. Merging leg-level status into a single timeline is what makes that question answerable.

The most valuable piece of information in intermodal transport is whether a delay on one leg puts the next connection at risk. Seen early, it leaves time to arrange an alternative connection or to warn the customer in advance.

One strength of the intermodal model is its potential to lower emissions. Rail and sea generally produce lower emissions per tonne-kilometre than road, so shifting the main leg to those modes reduces the total footprint.

More and more customers ask for the emissions data of their shipments. Having mode and distance recorded per leg is the basis for that reporting, and it allows emissions to be weighed alongside cost and time when choosing a mode.

TMS software treats an intermodal shipment as a single file and keeps its legs, carriers, documents and charges under that file. The planner does not have to manage each leg as if it were a separate shipment.

The main benefit comes from scattered information sitting in one place: the whole file can be seen, the dependencies between legs can be followed, and what was learned from past shipments can be carried into the next plan.