Easy project: Swapping loads on flatcar models ...
On my 60-foot flats, I put four small 4 x 4 stakes in the end stake pockets to secure the loads on the cars. Other cars, like the original Athearn 40 and 50-foot plastic flatcars, may require adjustments if the stake pockets are outside the deck. The stakes would keep the load from shifting side to side, but not end to end.