This is a bit complicated even in Czechia, with its densest network of railways in the world.

Trains are most efficient when they are long. 30+ cars, ideally. Capacity of railway lines is limited and lines tend to be shared by passenger traffic as well, so freight mostly moves at night and short freight trains are economically unviable.

It might take a long time to gather enough stuff/containers to fill 30 freight cars in one particular railway head (obvious exceptions such as Port of Rotterdam apply). Which means that you may have to wait for 10 days before your shipment actually starts to move.

We aren't that patient anymore.