This is a Lionel 6-21575 O SuperStreets 10 Straight Track - Railroad Xing (2). Add more realism to your roadways with Stop Ahead, RR Xing and other safety markings or roadways with Skid Marks, the remnants of drivers who didn't heed the warnings. Manufacturer: Lionel. Model Number: 6-21575. Scale/Era: O Modern. Model Type: Track/Switches/Etc.. SuperStreets roadway is functionally O gauge three-rail track built very unobtrusively into a realistic street. Because at heart SuperStreets is O-gauge track, you control the traffic on with your existing transformer. Visually the roadway pieces look very much like the concrete and asphalt streets in cities and town of the last seventy-five years. There is a countersunk screw hole in each piece, hidden by a detailed manhole cover. RailRoadster vehicles are designed especially for SuperStreets. However, any O gauge engine or motorized unit like vans, speeders, inspection vehicles, and trolleys run on SuperStreets.