The Lionel 6-16955 AT & SF Flatcar with ERTL Challenger Die-Cast is a model train accessory that features a replica of a Santa Fe flatcar with a die-cast ERTL Challenger locomotive included. The flat car is multicolored and made of diecast material, accurately representing the transportation theme of railroads and trains. This O gauge model is a detailed addition to any model railroad collection, appealing to enthusiasts of toy trains and hobbies.