The Alabama and Tennessee River Railway, an Omnitrax rr, would be a nice prototype to model, I think. I am more interested in CSX in the early 90s or freelancing, but I thought this might interest someone. It would be very interesting in N scale. It is a shortline that runs roughly from Guntersville to Birmingham. It is mainly a grain operation I think, but I know it serves a scrap yard. The motive power is very intersting. Mostly LTEX. Southern Pacific fans might also like these.
http://www.railpictures.net/viewphoto.php?id=163281
http://www.railpictures.net/viewphoto.php?id=126586
http://www.railpictures.net/viewphoto.php?id=129084 Old CSX MOW
http://www.railpictures.net/viewphoto.php?id=92531
http://www.railpictures.net/viewphoto.php?id=115273
http://www.railpictures.net/viewphoto.php?id=163281
http://www.railpictures.net/viewphoto.php?id=126586
http://www.railpictures.net/viewphoto.php?id=129084 Old CSX MOW
http://www.railpictures.net/viewphoto.php?id=92531
http://www.railpictures.net/viewphoto.php?id=115273