The Cass RR is definitely a great trip. The old locomotives chuffing along, blowing that smoke and embers, the view from the top, well worth it.
Another one, more modern, would be to catch the Amtrak at the ghost town of Thurmond and ride over to the Greenbrier.
"I tried to move my mind there and nowhere else and imagine a single detail that, if I didn't see it that weekend, I never would... The world is easily lost."