They are Roundhouse kits (maybe from the 1980's or 1990's?). I purchased 7 used cars on ebay with a non running IHC DC 2-8-0 Consolidation for $35. I was able to get 4 passenger cars out of the 7 in running condition. It was a nice find for me, it happened to be exactly what I was looking for. Then I got the engine cleaned & running sold it for $35.