The product is a book titled "Narrow Gauge Pictorial Vo V: Cabooses of the D&RGW 1987" which focuses on the caboose cars of the Denver & Rio Grande Western Railroad in 1987. The book is a collectible item that delves into the history and transportation aspects of the railroad, specifically highlighting the caboose cars used by the D&RGW during that year. With detailed illustrations and information, this book is a valuable resource for railroad enthusiasts and collectors interested in exploring the unique features of these narrow gauge railways.