The Atlas O Gauge Pennsylvania H21a Hopper Car 6778-3 Norfolk & Western #710073 is a ready-to-go pre-built model train car made of plastic at a 1:48 scale. This hopper car, themed around transportation, is designed for O gauge model railroads and is suitable for ages 17 years and up. With an analog control system, this vintage-inspired car is perfect for collectors and hobbyists looking to add a realistic touch to their model train layouts.