I was not suggesting that CTP should simply host the FY...I suggest they buy it outright ( for very cheap $).
And yes, it's a bit different from what you normally see there, but I don't think its a huge stretch. They do have a rather wide variety of non-logging railroad items in their collections, including an authentic B&M wooden caboose, a wood reefer, an REO speedwagon railbus, and GE switcher. I couldn't see them using it on the daily excursions, but it would make nice exhibit along the riverside where it would be maintained and protected from vandals.
IMHO, there's very little benefit to running the FY on the national rail system. The bottom line is that the costs associated with making that happen are astronomical, and the costs are perpetual. I say unless a truly "captive" operation like Clark's picks it up, it will likely never run again. ...and that might just be the right call.