This item is a single RTR model of CB&Q #184904, a PS-2CD 4740 hopper painted in the distinctive "CB&Q "Original Gray". Collect all 12 road numbers! And don't forget you can mix and match any 6, 12, or 24 PS-2 4740 or 4000 hoppers for a substantial discount - see our "Mix and Match" product SKUs on our website! Go in on a deal with your friends!