We have just about the dumbest freight rail operators, though. They care so much about cost curves that they regularly turn down highly profitable expansions because it would make the line go down. Being highly profitable isn't good enough when the line isn't going up. It also makes them absolutely allergic to capital expenses, not to mention how extreme their cost-cutting measures are (especially re: labor) even at the expense of safety. Cutting $10 of cost by rejecting $20 of new business is a bargain in the eyes of these morons.
Not to mention the pure madness of the track & right-of-way being privately owned. That shit is just bonkers.
I wonder how much worse our rail mode share would look if you did a comparison of countries without including unit trains. I suspect very, very much worse.
Also average rolling stock age is what, 20 years? And there's still units from the first days of modern roller bearings in service? Yeesh.