Reply to "What do you put in your Tinplate gondolas and hoppers, that looks "tinplate"??"

I use soft foam in 4-wheel 6-inch Marx tin cars to represent coal or gravel loads. I like to run about 10 cars in a train on O27 curves. Heavier loads would be a problem, causing derailments and straining loco pulling capacity. Foam loads also reduce train clatter.