The Immortal. At the time, I was enamored enough of the idea of using the cars as the setting for a business to incorporate a reasonable facsimile of them into my story, "The Devil's Eye" (sequel to "The Fugue Devil"; both stories appear in my short story collections, The Last Trumpet and Other Gods). If you've read "The Devil's Eye," you might recall the train cars being the setting for some significant carnage.
Alas, there was no major carnage there today, but I must tell you, they do serve a mean Bloody Mary at Southern Rail. It'll light a happy little fire in you.
Just to be fair, I'll leave you here with this handy fact about the Fugue Devil: If you know about it, it knows about you. And if you see it, it will come for you.
That would be bad, yes.