Back when steam ruled the rails, every loco has o have its firebox cleaned regularly. The engine was spotted over an ash pit where the fire was dropped and the grates shaken to remove unburned "clinkers" and hot ashes. These were allowed to cool in the pit, which also supported he rails. Made of stone and concrete, no wood was used because of the intense heat. This detailed kit is perfect for steam-powered industrial or shortline railroads and makes a neat addition to your engine service facilities.