As a kid I ran the o-27 curves too fast plenty of times and ended up with a train on its side - it was always a contest in my head to see how fast is just fast enough not to fail - but that was on a carpeted floor.
As an adult I launch Thomas of the end of the layout onto a concrete floor and fortunately only broke the coupler. I also have a Lionel Atlantic, 6-28071, I can't remember exactly what happened but the tender went to the floor. The one corner marker light popped off and that corner of the tender is dented. The LED still works. This was many years ago. I still run it on occasion but never did get around to trying to fix the damage.
