The wheels have been retrofit with a version of the bearing type axle the original red line cars used. The wheels are pressure fit onto the white bearing and the bearing is super glued to the axle (see pic). It is a really tight fit and it rolls very nice. I primarily build for the adult collector to display (not for children). The body has NOT been removed from the base for customization  Please see all the pictures. Shipped with USPS First Class Package. USA only