These two all-metal cars, which I received with a batch of partially assembled kits and completed rolling stock from the 1960s and '70s, are a natural for model railroads that have a steel mill, but they'll work well on almost any kind of railroad as cars being shipped from their manufacturer. The one on the left is a slag car and the one on the right a Pollock 75-ton Kling hot metal car, possibly made by Stewart Products. [Click on images to enlarge them.]