I liked your comments on the “no humping” pasted on the side of railcars. Having worked for a tier one Ford supplier who shipped assemblies via rail and over-the-road, I am familiar with the term “excessive humping” as it applies to rail shipments.
As I recall, the term was applied to damaged material which was the result of coupling cars at speeds higher than recommended. I resorted to installing impact recorders in the railcars to make claims against the railroads.
I assume that the same can result from the condition that you describe.