Thanks, Doug!

To answer your question, gondolas could haul anything that fits. A few images of these NKP gondolas show them with aggregate loads, possibly gravel or sand. But they could haul steel plate and steel shapes that were less than 40-feet in length. Crated or tarp-covered loads from manufacturers are another possibility. Rough cut lumber is another option.

These cars could wander, too. They were not restricted to NKP rails.

Eric Hansmann

Murfreesboro, TN