Thanks again Chris. I will contact Heathcote and see what they have to say, To be honest, the automation part of my plan isn't the most important thing in the world, the set up you have sounds very appealing. I'd love to hear more about the Picaxe circuits you built, I have watched the video of Everard Junction with great interest as they are very flexible in what you can achieve. He also uses the manual override switch doesn't he, something I think I could definitely get to work for what I want! The loco detection information is interesting, particularly that they have included that page when there is no guarantee it will even be released. I will watch with interest! Thank you Gordonvale, useful information! Ben