Someone had a stand at a Greenberg Show in Edison, NJ last year (probably is a regular at those shows, but I'm not sure) who makes 0 gauge flat cars with laser cut wood floors and engine loads that are some of the best rolling stock I've ever seen.
The loads are various engines or heavy equipment, in bright yellow, as I recall.
If anyone knows who he is or a website I can go to, please reply.
They were not cheap - at least $150 per car as I recall and some were over $200. They looked spectacular.