The Lionel NASCAR Expansion Pack #20 Tony Stewart with a 1:43 scale car (7-11009) is a collectible model train accessory that features a plastic 1:43 scale car designed in the image of Tony Stewart's NASCAR car. This expansion pack is suitable for O gauge model railroads, allowing hobbyists to enhance their layout with a detailed replica of Stewart's vehicle. With the Lionel brand known for its high-quality model train products, this pack is sure to be a popular addition to any collector's collection.