The MTH 20-94753 Santa Fe R50B Express Reefer Car is a model train refrigerator car designed for use on a three-rail system. With a scale of 1:48 and a gauge of O, this silver-colored car is made of plastic and diecast materials. It is officially licensed by the Santa Fe railroad and is brand new in box, making it a prized addition to any model railroad enthusiast's collection.