UNION PACIFIC MODEL FEATURES: 70-ton Roller Bearing trucks with 33" wheels Fully-assembled and ready to run out of the box Highly-detailed, injection-molded body Separately applied brake wheel Painted and printed for realistic decoration Machined metal wheels Weighted for trouble free operation Wheels with RP25 contours operate on all popular brands of track Body mounted McHenry operating scale knuckle couplers Window packaging for easy viewing plus interior plastic blister safely holds the model for convenient storage Replacement parts available Minimum radius: 18" WARNING: CHOKING HAZARD - SMALL PARTS! NOT INTENDED FOR CHILDREN UNDER 3.