Slag is the byproduct of steel making, made up of many different impurities. After tapping the furnace for steel, the slag is collected and sent to a separate facility for processing. Far from waste, slag can be reclaimed and used as an aggregate. Trains of slag pots carry the still-molten materials to large pits where they can be dumped to harden and cool. We're bringing back our slag and hot metal cars in two familiar road names with all new road numbers. The cars feature die-cast construction, a flickering and glowing load and a ladle which can be manually turned. Steel mill cars perform demanding work and don't stay clean for long! So we've also added a new unlettered scheme with only a number and weathered models typical of many mill cars. Die-cast metal sprung trucks and operating couplers Hidden uncoupling tab Flickering slag load Authentic paint schemes Manually rotating slag bucket Die-cast metal frame and slag bucket Separately applied detail parts PRODUCT SPECIFICATIONS Rail Line: US Steel Gauge: Standard O Scale Type: Scale Min Curve: O31 Dimensions: 7 1/4" long, each car Most Recent Catalog: 2016 WARNING: CHOKING HAZARD - SMALL PARTS! NOT INTENDED FOR CHILDREN UNDER 3.