You can. It’s called multimodal and basically is just picking a shipping container off a train car with a crane and putting it on a truck platform or a ship. 1 platform supports all modes.
This works great for finished consumer goods, but bulk cargo that makes up a significant portion of both rail and truck traffic like grain, liquid products (crude oil, gasoline, vinyl chloride), ore, etc. have very specialized transports that don't work well with the existing multimodal system.