Intermodal freight explained: How to move more with less carbon

Intermodal freight’s perception has seen a shift. While many shippers previously saw it as slower and less reliable than moving goods entirely by road, the picture has rapidly changed. Industry analysts now project the global intermodal freight transportation market to grow from around $58.85 billion in 2024 to $103.78 billion by 2028. This reflects a compound annual growth rate of more than 15.2%.

As supply chains become more complex, shippers in the UK and Europe are looking for ways to move more freight, with fewer emissions, while gaining a clearer view of their network. Increasingly, intermodal has become part of that answer.

This article walks through what intermodal is, how it differs from multimodal, why perceptions are changing, and how you can decide whether it is the right fit for your lanes.

Intermodal freight is the movement of goods using two or more modes of transport. This is typically done through a combination of road, rail, and sea. Importantly, intermodal loads stay in the same container or trailer from origin to destination, meaning that the freight itself is not handled when changing between different modes.

In a standard intermodal shipment, a container is loaded at the pickup facility, then moved by truck to a rail terminal, moved by train across a long-haul corridor, and finally moved by truck again to the delivery location. The contents are not repalletised or unpacked between those steps.

For shippers, that helps to protect product integrity, while reducing handling time and giving a consistent unit to plan around.

In the UK and Europe, most intermodal solutions fall into a few patterns:

The most common intermodal structure is road–rail, where freight travels by truck for the first and last mile and by rail for the long haul between terminals. This is especially effective on high-volume domestic and cross-border corridors where rail infrastructure is strong.

Road–sea (or road–sea–road) is also increasingly used on certain lanes, where moving containers by short-sea shipping over longer distances can be combined with trucks at each end.

The terms intermodal and multimodal are often used interchangeably; however, they actually describe different ideas. Intermodal focuses on the physical side of transport; a journey where your freight stays in one loading unit as it moves across modes.

On the other hand, multimodal typically describes the contractual side. It refers to using more than one mode of transport under a single contract with one transportation provider, who takes responsibility for the full journey—though that journey might not use a single container or trailer from end to end. An intermodal move can also be multimodal if you work with one provider across the full route, but you can also run intermodal shipments across separate contracts.

Historically, intermodal was viewed as slower and less predictable than road. Variables like unclear handoffs between operators and limited visibility meant it was often only reserved for freight that could tolerate longer lead times.

Several things have changed though, with digital tools making it far easier to track containers across modes and respond to disruptions, and with investments across European rail and terminal infrastructure improving service frequency and reliability. This gives shippers more confidence to plan around intermodal as a core part of their network, not just a niche option.

From an operations standpoint, intermodal freight can help carriers to move larger, heavier loads more predictably over long distances. Rail and sea legs are well suited to steady, repeat flows. This means that it’s easier to plan capacity further ahead and reduce exposure to short-notice constraints.

When it comes to sustainability, intermodal’s impact is often significant. Rail freight produces up to 76% fewer carbon emissions per tonne compared to road transport, with single freight trains capable of replacing 129 heavy goods vehicles (HGVs). Modern intermodal sea transport offers 30% to 45% lower CO₂ emissions per tonne-kilometre compared to road-heavy alternatives, with specialised routes reducing emissions by up to 70%.

Intermodal tends to work best when a few conditions are in place.

If you ship steady flows on the same corridors week after week, it’s often easier to build reliable schedules and secure capacity across terminals.

Intermodal transit times can be competitive, but they’re often less flexible than pure road solutions. If you need guaranteed next-day arrivals or frequent schedule changes, full-truckload (FTL) may still be the better option.

The closer your origins and destinations are to intermodal hubs, the more value you can typically unlock, reducing first- and last-mile trucking distances.

Dense, palletised, or non-perishable freight often travels particularly well in intermodal setups.

While intermodal has a whole host of benefits, it is not a one-size-fits-all freight solution. For example, ultra time-critical freight often benefits from the flexibility of dedicated FTL road shipments, where you can adjust timings at shorter notice.

Very short-haul moves, where origin and destination are close together, also don’t benefit from intermodal, as they usually don’t justify the additional complexity of transfers at terminals. In these cases, road-only options remain simpler and more effective.

Finally, highly specialised freight like temperature-controlled loads with narrow tolerances or products that require dedicated equipment, generally tend to be better suited to tailored road solutions.

The goal is not to replace road transport, but to use each mode where it adds the most value. Many shippers now blend intermodal with FTL and less-than-truckload (LTL) services to build a more flexible network.

If you decide to explore intermodal, a few practical steps can help you realise its full potential.

Map your major flows and identify long-haul corridors with stable demand, where emissions reduction is a priority and where suitable rail or sea infrastructure exists. These are often the best candidates to pilot intermodal.

Building in slightly more structured lead times gives your provider more room to optimise across modes. Work backwards from your required delivery dates to agree cut-off times that fit both your operations and the intermodal schedule.

Intermodal relies on smooth transfers between modes. Ensuring your pallets, labelling, and loading practices meet agreed specifications reduces the risk of delays and damage at terminals.

Whether you use your own transportation management system or a provider’s portal, make sure you have clear, accessible tracking for intermodal moves. That helps you keep customers informed and respond quickly if conditions change.

Providers like Amazon Freight can help you test which lanes are most suitable for intermodal, and where a different solution might serve you better. Share accurate volume forecasts and constraints upfront to make this process even more effective.

Intermodal is a core feature of how Amazon moves goods, particularly across selected corridors where rail and sea can replace long stretches of road. For shippers, this translates into practical options to move freight more sustainably, without having to build and manage an intermodal network on their own.

Amazon Freight can help you explore when intermodal is the right choice for your UK and European lanes, offering options that support your service goals while reducing logistics-related carbon emissions. Create your free shipper account today to get started.

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