I once saw a brass HO scale custom-painted C&O 2-6-6-6 jump off the track on a curve at a friend's layout with the track less than an inch from the edge, do a double-half-gainer and practically explode on contact with the concrete floor 5 feet below.
He was never able to repair it to be a useable locomotive, after several personal and professional attempts. He had over $1000 in the model and paint job, too.
