Designed to move variosu materials within a steel mill, the 3-in-1 Mill Gondola kit builds three typical heavy-duty gondola used for all kinds of service on steel mill railroads. This easy-to-build kit includes injection-molded parts as well as appropriate trucks with metal wheels and Kadee(R) knuckle couplers. These Mill Gondolas will look great inside your mill complex among other State Tool and Die steel mill cars and accessories.