Get the Athearn RND3186 4-pack of HO scale GATX 3 dome tank cars. These cars feature a separately applied brake wheel, wireform safety handrails, and machined metal wheels with RP25 contours. The highly-detailed, injection-molded body is painted and printed realistically. They are weighted for top performance, fully assembled, and ready to run right out of the box. With a minimum radius of 15 inches, they're great for your layout. Tank cars are specialized equipment, with interior linings and different steel types for different cargos. Couplers are McHenry Scale Knuckle, suitable for ages 14 and up, and no assembly is required.

Using these tank cars is easy. Just place them on your HO scale train track and start running them. They're fully assembled, so you don't need to do any extra work. When using, make sure the track has a minimum radius of 15 inches to avoid any derailment. Keep them away from sharp objects that could damage the detailed body. For maintenance, you can gently clean the body with a soft cloth. Check the wheels regularly to make sure they rotate smoothly. If you notice any issues with the couplers, you can contact customer service for assistance. And remember, these are for users 14 years and older, so keep them out of reach of younger kids.