I came across this website while furtleing about on Facebook, only had a quick look at it but from what I saw it looks very interesting. http://www.wymann.info/ShuntingPuzzles/About.html Cheer's, Pete. Just clicked on the link and it came up 404 error. The site page is titled, The Model Railways Shunting Puzzles Website, I will try that and report back. Just tried it and got straight through to the website.