Dogbone Expander Pack The Dogbone Expander transforms an oval into a great design for traffic cruising up and down your Main Street. SKU: 6-21291 Dimensions: None Gauge: Traditional O Gauge price: 29.99 year: 2007 rail line: None Minimum Radius: None Catalog Year: 2010 Catalog Title: Lionel Signature Edition Volume One 2010 Road Number: None TRACK INCLUDES: (8) D16 Curves (4) Curve to Curve Connectors 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