This is Bachmann 44441 HO 90-Degree Crossing w/Steel Rail & Black Roadbed. Each section combines track and roadbed into a single unit with snap-fit assembly and plug-in wiring to provide instant railroad fun. A hidden locking feature holds sections securely together until you re ready to take them apart. Easy to set up on any surface including floors and rugs: no special tools nails or boards are needed. A great system for Christmas displays or permanent layouts. Twelve sections of curved 18 radius track make a full circle; 16 sections of curved 22 radius track make a full circle. Manufacturer: Bachmann Model Number: 44441 Scale/Era: HO Modern Model Type: Track/Switches/Etc.