Lionel's Allegheny in Virginian livery was #28028 and came out in the mid-nineties.
I don't have the catalog in front of me, so date is approximate. It was advertised
as Lionel's first articulated and ran on 054 diameter curves. I've seen them in
magazine ads for $700-800. They had the Chesapeake and Ohio version also, but
I don't recall the catalog number.
Hoppy