THOMAS & FRIENDS OIL TANK - N Scale. Tankers, also known as Wagons, are round, cylindrical wagons designed for transporting liquids and other commodities. These tankers are based on standard 14 ton pre-war tankers common across most of regions. Bachmann Thomas and Friends Tankers come in a variety of colors and paint schemes. Bachmann carefully reproduces your favorite Thomas & Friends characters in N scale. All rolling stock features realistic character faces (where applicable), highly detailed, realistic plastic body shells, all-metal wheels, and Rapido-style couplers.