SuperStreets D16 Curve (1) D16 Curves nest inside D21 Curves for realistic 2-way traffic. SKU: 6-21430 Dimensions: 8 D16 Roadways to a 16" diameter circle Gauge: Traditional O Gauge price: 3.19 year: 2007 rail line: None Minimum Radius: None Catalog Year: 2010 Catalog Title: Lionel Signature Edition Volume One 2010 Road Number: None Manuals Find the latest manuals in our support section. Replacement Parts Buy any replacement parts in our support section. Contact Contact a service station to fix your product