The Atlas Through Plate-Girder Single-Track Bridge is a great addition to any HO layout. It's based on one of the most common bridges in use across the continent. It comes equipped with Code 100 nickel silver Atlas Snap Track with realistically spaced brown bridge ties. This easy-to-build kit includes parts for a single-track bridge. A double-track version of this bridge kit is available as part number 150-881 (sold separately). The bridge measures 8" 20.3cm long and the track length matches a standard Snap Track 9" 22.9cm straight section.