Chapter 01 · The Tour
What is intermodal & why it exists
The box stays sealed; only the mode underneath it changes. That one idea is the whole industry.
Intermodal freight transportation is the movement of goods in a single loading unit — a shipping container or a truck trailer — using two or more modes of transport, with no handling of the cargo itself when it switches modes. The container is sealed at the origin and not opened again until it reaches its destination.
The value proposition is simple economics. Rail is dramatically more fuel-efficient than trucking over long distances, but trains only run ramp-to-ramp. Trucks go anywhere but burn far more fuel per ton-mile. Intermodal stitches them together: a truck handles the short first and last mile, while rail carries the heavy line-haul across the country[1]. The result is lower cost, lower emissions, and fewer long-haul trucks on the highway.
The container is the backbone of global trade: more than 80% of world trade by volume moves by sea, most of it in boxes[2], and the U.S. rail intermodal system moved about 14 million units in 2025 [3].
Ocean vessel
Port to port
Rail linehaul
Cross-country, double-stacked
Drayage truck
First & last mile
Why it works
- Cost. Rail linehaul is cheaper per mile than over-the-road trucking.
- Emissions. Far fewer grams of CO₂ per ton-mile than a truck.
- Capacity. One freight train can replace hundreds of trucks.
- Security. The sealed box is handled less, so cargo is safer.
U.S. rail intermodal volume
Annual originations (containers + trailers), in millions.
Watch: how the container changed trade
A short explainer on how a standardized steel box reshaped the global economy.
The Shipping Container
Marginal Revolution University (embedded via YouTube)