Earlier quoted context omitted.
I am not sure it is useful to transport 2000 kg of metal occupying a half of a rail car, just to move 80kg meatbag for a distance of 173 miles.
It's useful because the rail doesn't go to your exact destination. You will need to drive there. It is expensive to have a separate car in both cities instead of just taking a single car with you.
The economics only make sense if you're hauling around masses of people, and you can't do that if all those people want to bring their cars with them.