The Lionel Trains #6-16123 Union Pacific 3 Dome Tank Car is a ready-to-go pre-built model train accessory in O gauge scale. Made of plastic and featuring a bright yellow color, this tank car is designed by the renowned brand Lionel and depicts the Union Pacific Railroad corporate roadname. With a vintage look and a theme of transportation, this three-rail system tank car stands at 2 inches tall, making it a perfect addition to any model railroads and trains collection for enthusiasts aged 17 years and up.