40' Single Dome Tank Car - CLARK #9485 - HO Scale. Single Dome tank cars are designed to haul a variety of oil's, chemicals, gases, and a variety of other liquids. Bachmann Singe Dome Tank Cars, come in a variety of colors and road names. Each tank car is fully assembled and features; Highly Detailed Painted Bodies with Precision Graphics (where applicable), Blackened Machined Metal Wheels with RP 25 Contours, Magnetically Operated E-Z Mate Couplers, Non-magnetic Blackened Brass Axles with Needle-point Bearings, Celcon Trucks, and Added Weight for Optimum Tracking Performance.