I'm not sure we are comparing apples to apples here. How much it cost to transfer let's say one container worth of stuff per week to place that doesn't yet have rail?

On scale rai is cheaper, but less you use the infra and less you transport at one time more expensive it will get.

Why do (some) profit seeking companies use trucks then?

because the massive subsidies on trucking can make them sometimes convenient enough to be worth it.

Oh, so what kind of expense are you talking about? Which costs do you want to include?

Obviously you are not talking about the market price?

Presumably the cost of road maintenance and the healthcare costs of the additional pollution - that's what I've seen brought up elsewhere when this subject was discussed at least.