Atlas O 3-Rail 21st Century Track System(TM) track is designed to have the look of North American prototype trackage. Sections feature Code 148 solid nickel silver rail, blackened center rail, scale-sized ties with accurate tie plate, spike and bolt detail a snap-lock system that securely holds the track sections together and ensures exact alignment and detailed rail joiners. The dark brown (or concrete-colored as specified) injection-molded tie strip has a special UV additive designed for both indoor and outdoor use. Flex-track is also part of the line offering you the opportunity for completely prototypical track planning. Perfect for use with all 3-rail O gauge trains. This track is part of the complete 3-rail and 2-rail AtlasO 21st Century Track System. Perfect for the modeler who wants to get started quickly, allows for easy hook up with no extra drilling to add power to the layout.