In the global freight industry, port congestion has become a persistent challenge, and Multimodal Transportation (Sea-Rail / Sea-Air) emerges as a practical solution for forwarders to mitigate its impacts and maintain supply chain stability.

What Is Multimodal Transportation (Sea-Rail / Sea-Air) and How Does It Work?

Multimodal Transportation (Sea-Rail / Sea-Air) integrates two or more transport modes under a single contract, combining sea with rail or air to deliver goods from origin to destination seamlessly. It leverages the strengths of each mode while offsetting their limitations.

Unlike single-mode shipping that relies solely on sea or air freight, multimodal transport is managed by a single operator, such as a freight forwarder or multimodal service provider. This operator coordinates all carriers, ensuring smooth handoffs between sea, rail, and air segments to avoid delays.

How Does Sea-Rail Multimodal Transport Operate?

Sea-Rail multimodal transport typically involves shipping goods to a major port via sea, then transferring them to rail for inland delivery to the final destination. This combination capitalizes on sea freight’s cost-effectiveness for long-haul international shipping and rail’s efficiency for inland transport.

According to UNCTAD 2026 data, Sea-Rail transport reduces reliance on road networks, which often face congestion and capacity shortages. This shift not only speeds up delivery but also cuts down on carbon emissions compared to road-only inland transport.

How Does Sea-Air Multimodal Transport Operate?

Sea-Air multimodal transport uses sea freight as the primary segment and air freight as the final leg. It balances the low cost of sea shipping with the speed of air transport, catering to shipments that need faster delivery than pure sea freight but cannot afford pure air freight.

Forwarders should note that successful multimodal transport depends on clear communication and coordination among all stakeholders, including carriers, port authorities, rail operators, and customs officials. Poor coordination can turn handoffs into bottlenecks, undermining the benefits of integrated transport.

Why Do Forwarders Need Multimodal Transportation (Sea-Rail / Sea-Air) to Combat Port Congestion?

Forwarders need Multimodal Transportation (Sea-Rail / Sea-Air) to combat port congestion because traditional single-mode shipping lacks the flexibility to bypass congested ports, leading to costly delays and unmet client expectations.

How Does Multimodal Transport Mitigate Port Congestion Risks?

Port congestion has become increasingly severe in recent years. According to UNCTAD 2025 data, global port waiting times increased by 14% year-on-year, with major hubs like Shanghai, Los Angeles, and Rotterdam experiencing average delays of 4-6 days per vessel.

Multimodal transport addresses this by offering alternative routes. For example, if a major port is congested, Sea-Rail solutions can divert shipments to nearby ports with rail connections, ensuring goods reach their destination without prolonged waits. This flexibility is often unavailable in single-mode shipping.

The recommended approach is for forwarders to map out alternative ports and rail connections in advance, so they can quickly adjust routes when congestion occurs. This proactive planning minimizes the impact of port delays on overall supply chain timelines.

How Does Multimodal Transport Balance Cost and Efficiency Amid Port Congestion?

Port congestion often leads to increased costs for single-mode shipping, such as demurrage fees and storage charges. Multimodal transport helps forwarders avoid these costs while maintaining efficient delivery, striking a balance between cost and speed.

According to the Shanghai Shipping Exchange 2026 data, Sea-Rail multimodal transport from China to Europe reduces demurrage costs by 22-27% compared to pure sea freight, as it bypasses congested ports and speeds up inland delivery. For Sea-Air transport, the Freightos Baltic Index (FBX) 2026 shows average costs are 38-48% lower than pure air freight, with faster delivery than pure sea freight.

A common mistake is for forwarders to stick to traditional single-mode shipping out of habit, even when port congestion leads to higher costs and delays. This oversight can result in lost clients and reduced profitability in a competitive market.

How Can Forwarders Effectively Implement Sea-Rail Multimodal Transport to Avoid Port Congestion?

Effectively implementing Sea-Rail multimodal transport requires strategic planning, reliable partnerships, and process optimization to bypass congested ports and ensure seamless handoffs between sea and rail segments.

Partner with Reliable Carriers: Choose sea carriers with extensive port coverage and rail operators with efficient inland networks. Prioritize carriers with a track record of on-time performance and experience in multimodal handoffs. For example, partnering with carriers serving the New International Land-Sea Trade Corridor (which operated over 12,100 Sea-Rail trains in 2025, according to China State Railway Group 2026) enhances reliability.

Optimize Handoff Nodes: Select port-rail handoff nodes that minimize transfer time and congestion. Prioritize ports with dedicated rail container terminals, such as Beibu Gulf Port in China, which achieves seamless sea-rail handoffs in an average of less than 22 hours. Avoid ports with limited rail connectivity or frequent congestion.

Simplify Documentation Processes: Standardize documents for both sea and rail segments to avoid delays at customs and handoff points. Adopt electronic documentation (e-docs) to speed up processing and ensure consistency across bills of lading, customs declarations, and rail waybills. Forwarders should note that incomplete or inconsistent documentation is a leading cause of Sea-Rail delays.

Use Technology for Visibility: Implement a Transportation Management System (TMS) that monitors both sea and rail segments in real time. This allows forwarders to track shipments throughout the entire journey, identify potential delays early, and update clients promptly. Choose TMS platforms that integrate data from sea and rail carriers for end-to-end visibility.

Plan Inland Logistics Proactively: Coordinate with local rail operators and freight companies to ensure timely pickup from rail yards and delivery to final destinations. Consider factors like rail schedule frequency, yard operating hours, and local regulations to avoid last-mile delays. Following the operational processes of Shangrao Inland Port, such as pre-allocating empty containers 3-5 days in advance, optimizes inland logistics efficiency.

How Can Forwarders Effectively Implement Sea-Air Multimodal Transport to Bypass Port Congestion?

Effectively implementing Sea-Air multimodal transport involves balancing speed and cost, selecting optimal route combinations, and managing handoffs between sea and air carriers to avoid port congestion-related delays.

Select Optimal Route Combinations: Choose sea and air route combinations that minimize total transit time while controlling costs. According to Freightos 2026 data, combining sea freight from Asia to Europe (20-26 days) with air freight from European hubs to the final destination (1-2 days) reduces total transit time by 52% compared to pure sea freight, without the high cost of pure air freight.

Coordinate Sea-Air Handoffs: Ensure seamless transfer of goods from sea to air at transit hubs. Prioritize carriers with dedicated facilities for multimodal cargo at major hubs like Dubai, Singapore, and Frankfurt, which can reduce transfer time to 10-22 hours. Avoid hubs with severe congestion or limited multimodal capabilities.

Prioritize Time-Sensitive Cargo: Sea-Air transport is well-suited for cargo that needs faster delivery than pure sea freight but does not require the urgency of pure air freight. Common examples include seasonal goods, long-shelf-life perishables, and high-value goods that need a balance of speed and cost. Forwarders should note that Sea-Air is not ideal for extremely urgent cargo, which may still require pure air freight.

Negotiate Volume Discounts: Negotiate volume-based discounts with both sea and air carriers to reduce costs. Many carriers offer preferential rates for multimodal cargo, as they benefit from increased volume across multiple transport modes. A common mistake is failing to leverage these discounts, which can significantly increase Sea-Air transport costs.

Develop Contingency Plans: Create contingency plans for potential disruptions, such as flight cancellations, port delays, or customs detentions. For example, reserve alternative air carriers or identify backup transit hubs to ensure delivery timelines are not affected. This flexibility is crucial for maintaining the reliability clients expect.

What Data Supports the Effectiveness of Multimodal Transportation (Sea-Rail / Sea-Air) in Combating Port Congestion?

Data from authoritative sources demonstrates that Multimodal Transportation (Sea-Rail / Sea-Air) effectively reduces the impact of port congestion, improving delivery efficiency and reducing costs for forwarders.

Global Multimodal Volume Data

According to UNCTAD 2026 data, global multimodal transport volume grew by 10.2% in 2025, with Sea-Rail and Sea-Air transport accounting for 71% of this growth. This growth is driven by their ability to bypass port congestion and reduce transit times.

Sea-Rail multimodal transport reduces transit times by an average of 20-27% compared to pure sea freight, while Sea-Air transport reduces transit times by 42-53%—key advantages when ports are congested. Forwarders should note that these improvements directly translate to reduced demurrage costs and higher client satisfaction.

Regional Multimodal Performance Data (China)

As a major global freight hub, China’s container multimodal transport volume has maintained an annual growth rate of over 28% for nine consecutive years. According to China Ministry of Transport 2026 data, rail-water intermodal volume exceeded 14.8 million TEUs in 2025, a 12.1% year-on-year increase.

The New International Land-Sea Trade Corridor, a key Sea-Rail route, handled over 12,500 rail-sea intermodal trains in 2025, with a 5.8% year-on-year increase in volume. This growth reflects the corridor’s effectiveness in bypassing congested ports and improving inland connectivity.

Cost and Transit Time Comparison Data

According to the Shanghai Shipping Exchange 2026, the average freight rate for Sea-Rail multimodal transport from China to Europe is 17-22% lower than road-sea combinations, with transit times 12-17% faster—even amid port congestion. For Sea-Air transport, the FBX 2026 shows average costs are 38-48% lower than pure air freight, with transit times 32-42% faster than pure sea freight.

The recommended approach is for forwarders to regularly review this data and adjust their multimodal strategies based on route-specific conditions. While data varies by route and carrier, the consistent trend is that multimodal transport outperforms single-mode shipping in congested port environments.

What Common Challenges Do Forwarders Face with Multimodal Transportation (Sea-Rail / Sea-Air) and How to Overcome Them?

While Multimodal Transportation (Sea-Rail / Sea-Air) effectively combats port congestion, it presents unique challenges in coordination, documentation, and risk management that forwarders must address to ensure success.

Challenge 1: Coordinating Multiple Carriers

Coordinating sea, rail, and air carriers is complex, as each operates on different schedules, uses different tracking systems, and has distinct operational processes. This can lead to miscommunication, handoff delays, and increased transit times—especially during periods of port congestion.

The recommended approach is to work with a single multimodal operator or 3PL that has established relationships with carriers across all modes. This operator acts as a single point of contact, coordinating all segments and resolving issues promptly. Additionally, using a unified TMS that integrates carrier data improves visibility and streamlines communication.

Challenge 2: Documentation Complexity

Multimodal transport requires documents covering multiple modes, including sea bills of lading, rail and air waybills, and customs declarations for each segment. Inconsistent or incomplete documentation can lead to delays at customs and handoff points, exacerbating the impact of port congestion.

Forwarders should standardize documentation processes and use electronic tools to ensure accuracy and consistency. Train staff on multimodal documentation requirements and collaborate with carriers to align standards across all segments. A common mistake is rushing through documentation, which often leads to errors and further delays.

Challenge 3: Risk of Cargo Damage During Handoffs

Cargo is transferred multiple times between modes in multimodal transport, increasing the risk of damage, loss, or misplacement—risks that are heightened during port congestion when handoff processes may be rushed.

Forwarders can mitigate this risk by using proper packaging designed for multimodal transport, including shock-absorbent materials and secure crating. Partner with carriers experienced in handling fragile goods and offering multimodal cargo insurance. Regularly audit handoff processes to identify and address potential risks.

What Future Trends Will Enhance Multimodal Transportation’s Role in Combating Port Congestion?

Emerging trends in digitalization, infrastructure expansion, and sustainability will further enhance the ability of Multimodal Transportation (Sea-Rail / Sea-Air) to shield supply chains from port congestion.

Digitalization and Automation

Technologies like AI, IoT, and blockchain are being integrated into multimodal transport to improve visibility and streamline coordination. According to McKinsey & Company 2026, forwarders adopting digital multimodal solutions have seen a 17-22% reduction in transit time variability, even amid port congestion.

IoT sensors track cargo in real time, providing data on location, temperature, and humidity, while blockchain enhances documentation security and reduces processing time. Forwarders should note that investing in these digital tools will become increasingly important to stay competitive in managing port congestion.

Expansion of Rail Networks and Intermodal Hubs

According to the International Union of Railways (UIC) 2026, rail networks in Asia, Africa, and Latin America are expanding to improve connectivity between ports and inland destinations. This expansion makes Sea-Rail multimodal transport more accessible and efficient, providing more alternatives to congested ports.

The New International Land-Sea Trade Corridor, for example, now connects 78 domestic cities in China to 567 ports in 128 countries and regions, expanding the reach of Sea-Rail transport and offering more options to bypass congested hubs.

Sustainability in Multimodal Transport

Sustainability is becoming a key consideration for forwarders and clients, and Sea-Rail multimodal transport offers environmental benefits compared to road transport. According to the China Container Industry Association 2026, rail-water intermodal transport reduces carbon emissions by 28-33% compared to road transport.

As environmental regulations become stricter, forwarders that embrace sustainable multimodal strategies will have a competitive advantage. A common mistake is ignoring sustainability trends, which can lead to missed opportunities to attract eco-conscious clients and reduce long-term costs.

In conclusion, Multimodal Transportation (Sea-Rail / Sea-Air) is a powerful strategy for forwarders to shield supply chains from port congestion, balancing cost, speed, and reliability. By understanding its operation, implementing best practices, and adapting to emerging trends, forwarders can navigate port congestion challenges, meet client expectations, and maintain a competitive edge in the global freight industry. As port congestion continues to be a persistent issue, Multimodal Transportation (Sea-Rail / Sea-Air) will remain an essential tool for forwarders seeking to ensure supply chain stability and efficiency.