Hi - Up for bid is a brand new, Mint in the Box, Lionel 6-9554, Chicago & Alton add on car.  What that means is that Lionel produced a complete Chicago and Alton Train Set, and then at a later date, decided to add on another unique, separate sale, additional car This unit, therefore, is rather rare as the number of these cars produced is far less than the number of sets produced and sold in 19891.  This rather rare passenger car can be yours for the correct bid.  Thanks for Looking and Good Luck Bidding!