I ordered Lionel's PS4 REA flat car & trailers (6-27067) some time back and had actually forgotten about it when my LHS called last week and said it had come in. I recall now I loved the idea because it was modeled after a prototype for 1952, supposedly - and I try to make my layout very 1955ish.
Anyway, this is just a splendid bit of roling stock. Very heavy - lots of metal. And detail, with moving frameowkrs to hold the front of the trailer, etc (they are metal, too, not plastic. I love it. As shown in the photos, I have made one adjustment. It was delivered with one of the unloading ramps on each end. I moved one so that both are on the same end: not sure if one at each end is prototypical but I like the look this way a lot more.
I originally order this with the idea of converting at least one of the trailers to superstreets to pull behind one on my tractors, and I still might, but not if I can't find a way it can go back on this trailer. it really is lovely.