Hi All I certainly am listening to you all but there is lots to assimilate in the various posts. I Include below a sample layout where I have followed the tracks around and I use red and black markers to indicate the polarity of the rails, and come to the dreaded "short" where i then include a break, marked in green, and a rail gap at both ends, protected by a RLM. I have downloaded "Do I need a return loop" to study closely. Many thanks to you all. Cheers Matthew