This thread has become the WIP thread for my switching puzzle see the updates for specific posts or feel free to browse the whole thread! Comments are welcomed! Original Post: So after a trip to the local train club (scale trains n, ho, S, O) basically think a large room with about 12 different layouts running.  One of the club members created a 4x2 HO switching puzzle and it was a lot of fun.   I know I've seen switching puzzles at model RR shows but I haven't seen any in the Lego world.  So I've been reading through decoupling and other tricks that have been posted.   My question comes...  Has anyone had any luck with switching puzzles in Lego at shows?  Did they go over well or was it more hassle then it's worth?  Current form: Updates: