Model railroaders building an HO scale layout - these Atlas Code 83 track bumpers are essential for ending your rails neatly. You get a pack of 4 bumpers, Atlas part number 518. They're designed for Code 83 rail (the rail height), which is a popular size for detailed, modern-era HO scale layouts. Bumpers are placed at the end of spur tracks, sidings, or stub terminals to prevent rolling stock from accidentally rolling off the rails. They add realism and functionality to your layout. Made by Atlas, a trusted name in model railroading. Easy to install - just slide them onto the ends of your rails and secure. Perfect for industrial areas, yard tracks, or any place where tracks need to terminate. Having a 4-pack means you can secure multiple track ends around your layout. A small but important detail that makes your model railroad look more complete and operates more realistically.