SMITHSONIAN HISTORIC TRAINS Add some history to your layout with our Made in the USA Smithsonian Historic Trains Boxcars! A(r)2017 Smithsonian Made in USA of US and Imported Parts Die-cast metal spring trucks Operating couplers Metal frame Opening doors PRODUCT SPECIFICATIONS Gauge: O Gauge Scale Type: Traditional Power: Electric Min Curve: O27 Dimensions: Length: 10 1/2" WARNING: CHOKING HAZARD - SMALL PARTS! NOT INTENDED FOR CHILDREN UNDER 3.