Happy April Fool's Day!
Here are two shots showing the D&H suffering from an April 1st, 1972 (exactly 50 years ago), mishap. I would guess that it involved a pusher engine bumping the caboose (#35711) a little too hard from behind.
I would hate to have been riding this caboose during the scary event. It is a good reminder that railroading is hard work and not the romantic notion that we think it is.