RMT 963913 Ready Made Trains Horseshoe Curve Beer Altoona Brewing Company 4-Bay Hopper O Gauge. Featuring prototypical painting and lettering. opening hopper doors, metal brake wheel, sprung metal trucks, operating die-cast couplers and metal sideframes. Measures 9 1/2". Check out our additional listing for all of the covered hoppers available. Operates on O-27 curves. New in the original box. If you have any questions: please leave us a message here or call 1-800-786-1888.