Atlas O 2-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, 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. Perfect for use with all 2-rail O Scale trains.