My Dad had the worst two with my trains.
The worst was when he was running the inside loop on a Christmas layout. He put Thomas back in a siding, and went to get the Amtrak set out, but Thomas wasn't back far enough in the siding to have power shut off, and they collided, sending train cars into the back of the chair Grandpa (who bought all the trains) was sitting in! Neither Grandpa nor I were too happy about that, but there was no damage.
My Dad also turned over a 675 on a curve, causing it to fall two feet to one of those fake brick floors for around a fireplace. Broke off a marker light, and made a few chips in the paint.
Dad isn't allowed to run trains now; not even his own trains on my layout.
