Since Amtrak uses some CSX tracks, I thought this article might be of interest here. It's a summary ot an article in the British "Financial Times," which is accessible by subscription only.
Here's one quote: CSX CEO "Harrison said he was not going to buy locomotives or double-track CSX’s routes to accommodate coal."
If you're an optimist, this might mean less traffic competing with Amtrak trains sharing the same tracks. If you're a pessimist, you might be more concerned about shrinking incentive for CSX to maintain those tracks.
I'm no expert about any of this. Hope others here with broader knowledge will chime in.