Small iron-steel hot metal cars

This photo from an old (perhaps early 1900s) catalog advertising the double truck locomotive crane also shows some interesting small hot metal cars.  The fact that workers are shown posing on the cars indicates there is no hot metal in the cars.  These cranes were self powered and often used for moving short strings of cars in industrial areas.  The lettering on the crane is hard to read but seems to including the word Cleveland.

These small cars were most likely used in a large foundry rather than a steel mill due to the limited capacity.  As was typical of hot metal cars the numbers on the cars appear to be hand painted.  Those white "bottles" on the crane deck could be oil for the machinery.