A port is a complex interplay of people, machinery, and transport modes. Containers are unloaded and loaded, trucks arrive at terminals, trains connect the port to the hinterland, and ships must reach their berths as precisely as possible according to schedule. But what happens when a part of this system suddenly comes to a standstill?

A port strike can impact numerous supply chains in a very short time. It doesn't even require the entire port to be shut down. Depending on which employees or companies are affected, individual terminals or specific operations may be restricted.

For logistics, one thing becomes the priority: replanning.

A port is more than just the quay wall

When people think of a port strike, they often first imagine ships that cannot be loaded or unloaded. However, the effects can reach much further.

A container transport involves, among others:

• Terminals
• Dockworkers
• Shipping lines
• Trucking companies
• Rail operators
• Inland shipping
• Depots
• Freight forwarders
• Shippers and consignees

If one part of this system falters, the disruption can ripple throughout the entire transport chain.

What happens to the ships?

If a terminal cannot process a ship as planned, the shipping line must react to the situation. Depending on the duration and extent of the restrictions, various scenarios are possible.

For example, a ship may wait for an available berth. This doesn't just delay the processing of that one ship. Since container ships on liner services call at several ports in succession, a delay can also affect subsequent port calls.

In other situations, shipping lines may adjust their schedules or skip a port entirely. Then, a decision must be made on how the affected containers will reach their intended destination. In this way, a local problem can impact a much larger part of the network.

And what happens to the containers?

A distinction must be made here between imports and exports.

Export containers

An export container may already be on its way to the port or even sitting in the terminal. If the scheduled ship cannot be processed or its port call is changed, the container may have to wait for a later departure. Depending on the situation, it may also be possible to check whether shipping via another port is feasible and economically viable.

Import containers

With imports, the ship may have already arrived, but the container might still not be available. If unloading cannot take place as planned, the subsequent provision is also delayed. And even a container that has already been unloaded still needs to get out of the terminal. Consequently, a disruption at the port quickly affects onward transport by truck, rail, or inland waterway vessel.

Why a one-day strike can have an impact lasting longer than a day

This is one of the crucial points. If a terminal, for example, operates for 24 hours less or not at all, the ship calls and container movements planned for this period do not simply disappear. They must subsequently be processed in addition to the regular traffic.

This can lead to backlogs:

• Ships wait for berths.
• Containers accumulate in the terminal.
• Pick-up and delivery appointments are delayed.
• Trains and trucks must be rescheduled.
• Subsequent ships may arrive before the backlog has been fully cleared.

This is why a relatively short interruption can affect operations for several days.

Can you simply use another port?

Theoretically, the solution sounds simple: Hamburg isn't working? Then just send the container via Bremerhaven, Wilhelmshaven, Rotterdam, or Antwerp. In practice, it is more complicated.

An alternative route must first be available at all. This involves, among other things, the following questions:

• Does the shipping line call at the alternative port?
• Is there sufficient capacity there?
• Is suitable container equipment available?
• How will the goods reach the alternative port?
• What additional costs will be incurred?
• Will the transit time change?
• Do bookings or documents need to be adjusted?
• How does the final leg of transport work at the destination?

There is also another effect: if many shipments divert to other ports at the same time, this can create additional pressure on terminals and hinterland transport there as well.

Rerouting is therefore a possible solution – but not an automatic emergency exit.

Road, rail, and inland waterway transport are also affected

A port only functions if containers can get in and out. That is why the connection to the hinterland is at least as important as the seaside. If terminal capacities fail or schedules change at short notice, truck appointments and rail connections must also be re-coordinated.

A train that has already been booked does not necessarily wait for a delayed container to become available. Conversely, a container may be sitting in the terminal while the originally planned onward transport option is no longer available.

A problem at the quay quickly becomes a challenge for the entire transport chain.

What can a freight forwarder do in this situation?

A freight forwarder cannot, of course, prevent a strike. Instead, their task is to identify the impact on the respective transport as early as possible and to evaluate options for action.

This can include:

• evaluating current information from shipping lines and terminals
• identifying affected bookings
• checking alternative departures
• comparing potential alternative ports
• Reorganize pre- and on-carriage
• Evaluate transit times and additional costs
• Inform customers about changes at an early stage

The key is not to choose a different route at any price. Sometimes rebooking makes sense. In other cases, it may be more economical or even faster to wait out a short delay. Good logistics therefore also means weighing different options against each other.

Planning creates a buffer – but no guarantee

Not every disruption can be foreseen. Nevertheless, companies can make their supply chains more resilient. For particularly time-critical goods, for example, it can be checked whether longer time buffers are necessary or if alternative transport routes are generally available. Early booking and complete documentation also help to prevent additional avoidable problems during an already tense situation. Because when capacity becomes tight, flexibility is particularly valuable.

When operations resume

The end of a strike does not automatically mean the supply chain is back to normal. First, backlogs must be cleared and schedules stabilized. Containers must be unloaded, picked up, and transported further. At the same time, new ships and new cargo arrive.

How quickly the situation normalizes therefore depends on many factors: the duration and extent of the work stoppage, the previous utilization of the port, and the available capacity after operations resume. For shippers, it remains important to continue monitoring their own shipments closely even after the official end of a disruption.