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| Term | Meaning |
| Tare weight | The weight of the vehicle when it is empty. |
| Tariff | A document issued by a carrier setting forth applicable rules, rates, and charges for the movement of goods. The document sets up a contract of carriage between the shipper, consignee, and carrier. |
| Tonnage | Deadweight, gross, net, displacement; a quantity of cargo normally expressed as a number of tons. |
| Ton-mile | A freight transportation output measure that reflects the shipment's weight and the distance the carrier hauls it; a multiplication of tons hauled and distance traveled. |
| Tracing | Determining a shipment's location during the course of a move. |
| Tracking | A carrier's system of recording movement intervals of shipments from origins to destinations. |
| Tramp Service | Vessels operating without a fixed itinerary or schedule or charter contract. |
| Transit time | The total time that elapses between a shipment's delivery and its pickup. |
| Transmittal Letter | A letter from the shipper to its agent that lists the particulars of a shipment, the documents being transmitted, and instructions for the disposition of those documents. |
| Transshipment | The shipment of merchandise to the point of destination in another country on more than one vessel or vehicle. The liability may pass from one carrier to the next, or it may be covered by Through Bills of Lading issued by the first carrier. |