What is transshipment in container shipping?

Transshipment is the transfer of a container from one vessel to another at an intermediate port before it reaches its final destination. The box is discharged at a hub, held in the terminal yard and loaded onto a different ship, often a feeder to a smaller port or another mainline service. Maersk defines transshipment as “offloading a container from one vessel and loading it onto another vessel”, and notes that it happens when there is no direct connection between origin and destination ports (Maersk). The spelling transhipment is also used.

Transshipment is how a carrier serves a port whose volumes do not justify a dedicated mainline call, and it is also a source of delay and fragility that a headline transit time rarely shows.

Why carriers transship instead of calling direct

Direct calls are easier to sell. A carrier that sends a mainline ship to a small port ties up capacity, reserves a berth window and depends on whatever volume that port produces. A hub lets the same carrier collect boxes from several smaller ports, concentrate them on one large vessel and offer a frequency that no single port could support. Port Economics describes the trade-off: shippers want direct services between their preferred ports, while carriers prefer indirect routing through hubs to capture more cargo and benefit from scale economies (Port Economics).

The case strengthens with vessel size: larger ships need more cargo at each call, so concentrating demand at a hub is worth more. The constraints are set out in how container ships are sized.

The three ways a container changes ship

Port Economics separates the bundling of cargo across services into three models. The first is the common case; the other two describe handovers between mainline services rather than to a feeder.

Model	What happens	Where it fits
Hub and feeder	A mainline ship discharges at a hub and a feeder carries the box to a smaller port	Regional coverage where volumes do not justify a mainline call
Interlining or intersection	Two mainline services exchange boxes at a port both call	Carriers extending coverage without adding a loop
Relay	A box moves between two mainline vessels, often on the same carrier’s network	Joining two deep-sea legs at a hub

Source: Port Economics, Management and Policy.

These models can stack. A box may arrive on a mainline ship, wait at a hub, cross to a partner’s service and finish on a feeder. Port Economics notes that some containers undergo as many as four transshipments before final discharge.

What makes a port a transshipment hub

Port Economics lists three common characteristics: nautical accessibility, proximity to main shipping lanes and ownership, in whole or in part, by carriers or multinational terminal operators. A working hub also needs berth productivity, yard capacity and a dense feeder network, because its job is to move boxes between ships quickly.

Most intermediate hubs sit along the main east-west beltway: Southeast Asia, the Middle East, the Mediterranean and the Caribbean. The text names Tanjung Pelepas, Salalah, Tanger Med, Algeciras, Malta, Freeport and Gioia Tauro, among others. Jebel Ali illustrates the scale: UNCTAD estimates that more than 30 million TEU of containerized port traffic in the vicinity of the Strait of Hormuz reflects large transshipment activity at the port (UNCTAD).

Not every large container port is a hub. Port Economics puts the container ports of Northern Europe, North America and mainland China mainly in the gateway category, serving their own hinterlands rather than significant transshipment volumes.

What transshipment costs the shipper

Transshipment is not free, even when the quotation does not show it as a line item. Port Economics identifies the direct costs: extra handling at the intermediate terminal, longer transport times and distances, and the cost of both. Each additional lift is also another point where a box can be damaged, misrouted or held for inspection.

The larger cost is usually connection risk. If the inbound vessel arrives late, the box misses the outbound sailing and waits for the next one. A hub with poor schedule reliability turns a short connection into a rolling delay, which is why schedule reliability matters as much on the connection as on the deep-sea leg. A routing with two handlings has less slack than a direct call, and the gap widens when the hub is congested.

Ask for the connection port and time, check whether the quotation includes hub-level inspection charges, and compare the routing with a direct service even at a higher price.

How to read a transshipment routing

• Count handlings, not ports. Two ports can mean one direct sailing; three ports can mean two handovers.
• Identify the hub. A pure transshipment hub is more exposed to a carrier changing its network than a gateway that also handles local cargo.
• Check the connection. Compare the published connection time with the carrier’s recent reliability at that port.
• Check the direction. A hub can shorten the sea leg by putting the box on a mainline ship for the long ocean crossing, so transshipment is not automatically slower; the penalty is handling and waiting, not the concept.
• Confirm the spelling. Transshipment and transhipment describe the same operation.

Common misreads

• Transshipment is not transloading. Transloading moves cargo out of one container and into another, or between transport modes. Transshipment keeps the same container and changes the ship.
• Hub throughput is not local demand. A transshipped box is handled at the hub as well as at its origin and destination, so a hub’s TEU figure reflects network position as much as local trade.
• A big port is not necessarily a big hub. Gateway ports can top throughput rankings without handling much relay cargo.
• Transshipment is not a sign of a weak service. It is how many small and medium ports get global coverage.
• One transshipment is not the same as many. Each additional handling adds time and risk, so the count matters more than the label.

What to watch

Alliance reshuffles, service restarts and a staged return to Suez all redraw which ports act as hubs and which connections survive. Gemini Cooperation’s new Asia-Mediterranean loop, reported in our 20 October briefing, is designed as a transshipment hub-only service, which shows how one alliance’s routing decision can concentrate relay demand on Tanjung Pelepas, Algeciras and Tangier.

Watch hub congestion next. When a hub fills, connection times stretch and carriers roll cargo, pushing delay into the next leg; automation and berth investment raise capacity but do not remove that risk.

Finally, watch the split between gateway and transshipment traffic. Port Economics argues that pure transshipment hubs are vulnerable because cargo can move to a new terminal on a new lane, while ports that combine transshipment with gateway cargo are more durable.

Sources

• Maersk, 5 ways to boost ocean transshipment reliability (30 May 2024): https://www.maersk.com/insights/resilience/2024/05/30/five-ways-to-boost-transshipment-reliability
• Port Economics, Management and Policy, Container Services and Networks (updated 29 June 2026): https://porteconomicsmanagement.org/?page_id=1532
• UNCTAD, Review of Maritime Transport 2025, chapter 2 (24 September 2025): https://unctad.org/system/files/official-document/rmt2025ch2_en.pdf