Cataloged in 1960 only, LIONEL set #2555W often called the "Father & Son" or, "Over & Under" set is THE rarest of all the post-war sets. I don't think there are more than 2 or 3 complete sets still in existence. Most of the components of the set fairly commonplace, but the high value attributed to this set lies with: The #111-50 trestle set; the #6357-50 ATSF caboose, and, most importantly, all the cardboard packaging.
I am, by far, NO expert on Lionel post-war sets, but Greenberg's@ Guide to Lionel Trains, Volume III, will tell you almost all you need to know - including everything in the above paragraph, which I got directly from it!
PPS. 136-137!
The book lists the going price at $10,000, in LN condition, but that's several years old. Frankly, $100,000 might be more like it. In any event, certainly not my field of expertise.
But now here's a good question: which set is meant to be the 'Father's' and which is 'Son's'?? I 've heard conflicting opinions: that the HO set was the 'Son's' - because it was smaller - but also, I've heard the HO set was for 'Pop' because HO gauge is more to scale, and finely detailed - not a 'toy train' like the Super '0' set?
I welcome comments and opinions from my fellow forum members! Your thoughts please?
-Len Carparelli