Have found the little "bumpers" on the Thomas Christmas set seem to break off quite easily so if you have small pets/children in and
around those little trains might want to be observant.
Side note: I had used some plastic model cement to put one back on, however it did come off again. The second time I have used just
a drop of CA medium adhesive and let it sit for about one hour before touching. Seems to hold but not as "solid" as I would like.
Merry Christmas