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Cargo shipping is a mix of all modes. Rail has a lot of good things going for it, but capacity is limited, routes are limited, speeds are limited, and trains are fairly inflexible.

Trucks can be used for a lot more things. They might not be ideal for long distance routes, but they're often used for them. Dock to dock time is often going to be far less with long haul trucking than truck to local train depot, rail to remote train depot, truck to remote dock.

It's also much harder to build rail capacity than road capacity; certainly that'a a function of our government, but someone with one container to move has to work within the environment.

Trucking also feels like it has more agency. If your truck fails, you can send another to pick up the load; if your train fails, you're at the mercy of the railroad. If there's disruptive weather in the path, a truck can drive around it; almost always a train will have to stay on its route, and may need to stop for the weather to clear. If the shipment needs to be recalled, the truck can turn around; you might be able to get your load off the train, but maybe not?