Hi all, This is my first post to the forum so I decided to offer something i recently discoverered, this may have been said before but I can't see it. On my first layout with powered points i used a common negative wire and two positives. I had no CDU so the trains slowed down every time the switch was changed and I needed three wires. By two diodes I discovered that you could use only two wires and have the direction controlled by the polarity... --Chris (Sempak) Bio: I am 14 and live in Melbourne, Australia my dad bought a HornbyThomas The Tank Engine set when I was about eight but it never got assembled until I was 11 . I now have a 'work-in-progress' 8' x 6' layout still using some of the original track but also some Peco flex, Peco 18" curves, Peco points etc. My local trains shop stocks a lot of Peco stuff!