Lillabo Train Duplo Adapter

My kids have these IKEA trains that work pretty well but the tops they come with keep popping off. I noticed the train is almost the same size as a 2x4 duplo plate, and we have tons of duplos, so wouldn't it be nice if they were compatible. Anyway, here we are. This fits right over the pegs on the linked train set. I intentionally made it a bit tight on those pegs given the trouble with the models it came with. A toddler may struggle to remove the adapter from the train bottom which is a pro I think. The duplos are also slightly tight as well though within toddler range, overall I figure this was made to be moved around and a little extra friction is a benefit.