The ex-L&N U25B was a bit of a touchy subject. Originally built as L&N #1616, it then moved onto the Family Lines/Seaboard Systems roster and became Seaboard #1616. Then Seaboard and Chessie merged and it became CSX #3416. It was the last operating U25B on the CSX roster, and in 1991 hauled it a train into Baltimore, was unhooked and then run over to the B&O Railroad Museum, where CSX donated it to the museum. The B&O Railroad Museum, which had stopped being a corporate-owned museum and had become an independent non-profit in 1989, decided to move it's collection towards collecting primarily B&O pieces, and wasn't interested in an L&N U25B, especially since it came from the other side of the family (and even that didn't mean stuff was safe, since the museum got rid of a C&O SD18 around that time). They used it for a while to switch stuff around the property, but after a while decided to lease it to Tennesee Valley Railroad Museum, since that was L&N territory. It went down to TVRM, where it was put back into it's L&N #1616 appearance and put on display at the Grand Junction property.
After a couple years of leasing it, B&O Railroad Museum got tired of the whole arrangement and made rumblings about wanting to sell it. TVRM declined the offer, and because TVRM was more familiar with museums in that era, B&O Railroad Museum asked TVRM to ask around if any museums in that area were interested in buying it. B&O Railroad Museum never received any word from other museums interested, and so they sold the U25B off to RMDI. When news of #1616 being moved north to PA to be sold to a rebuilder/dismantler got out, all sorts of museums and historical groups in L&N territory cried out over why #1616 hadn't been offered to them. In particular, Kentucky Railway Museum, which is basically the unofficial L&N museum, was irritated, since they had been in the market for a new diesel locomotive and the #1616 had even been operable. The L&N Historical Society was also pretty upset, because they had funded the painting and renumbering of the #1616 back into L&N colors.
It then came to light that TVRM had not ever contacted any of the other museums in the region. Their hope had been that when B&O Railroad Museum didn't get any offers, they would be able to swoop in and go "Well, if no one else wants it, we'll take it" and score it for some firesale price. They didn't expect that the B&O Railroad Museum would instead sell it off to RMDI. Once it went up to RMDI, the Delware-Lackawanna guys moved in and grabbed the generator and traction motors for one of their C425s. It was eventually purchased by a private owner, who moved it to the Southern Appalachia Railway Museum in Oak Ridge, TN and I know he had hopes to one day make it a complete operational locomotive, but I imagine that with SARM no longer being able to run excursions over NS like they used to, that won't be happening anytime soon.
Sad story for what was once a complete operating U25B, none too represented in preservation, that was basically cast off by two museums.