As I alluded to in my earlier post, the Lionel mill gondolas are so big they just about qualify as "layout shrinkers"...
The smaller gon is one of the low-slung RailKing gondolas. Fits nicely inside the Lionel one
Of course I have both sizes of Lionel's traditional gondolas, as well as die-cast K-Line ones, MTH Premier (which I only recently discovered two of the three I had forotten I'd ordered), Atlas Trainman as well as their 1970's predecessors, a few Menards, two GGD battleship gons, several Kusan (and Williams-branded reboots of same) and at least one from Industrial Rail.
---PCJ