This may not count for what your asking, but it sorta does. My dad had some postwar that he had boxed up and stashed away. I would take them out and run them on the layout, and it would drive him NUTS! I remember one was the red Lehigh Valley hopper with white lettering. Another was this lone passenger car. It has no stripes at all, and lettering on only one side. I was told Madison Hardware got this as a Lionel factory reject, but Madison sold it anyway. I don’t know if there are more cars like this out there. I think after Richard Kughn bought Madison Hardware this kind of thing came out of the woodwork.
*Edit* Looking at these pictures, I should put that dumb bulb in the 6557 caboose. I searched everywhere to find that special bulb! That’s another car my dad would be annoyed when I would run it.
