I once bought a piece of Glasgow Blue train (don't ask) from a guy in Leeds. I was going to go down with a large trolley and collect it, but he decided that he'd have a holiday in Scotland instead, so he came up with it and various other things Not listed on Ebay which I bought too.
Now THAT'S service!
No. I really have to ask -Which bit? I know someone with a share in class 47, and dream of a patio/pizza oven made from the footplate & backhead of almost anything, but can't imagine a remnant from the Cathcart circle hanging above the fireplace.
I do have a chair from the Corsican railway bookend, 'though.