There's a blurb in the most recent Classic Trains magazine about a visit to the Pennsylvania's hump yard in Conway. Dwight Long, the author, says:
"After a while I saw a boxcar with a prominent DO NOT HUMP sign going over the crest. I inquired of the tower man about this. His reply: 'Oh hell, sonny, at Conway we hump everything except dynamite, and after dark we hump that too!' "
Unfortunately, it's not dated as to when this conversation took place...
"Do Not Hump!?!?! Does that mean what I think it means?!?"--Michelle Blanchard
"People saw wood and say nothing, but railroad men saw trains and say things that are better left unprinted."--Charles De Lano Hine