Oh yes, what the wires are for and what colours they are. sorry about that! The red and black are from the left and right rail of the DCC track sub buses. Because I use occupancy detection via a BDL168 board, each turnout is actually part of an occupancy detection section, either linked to some plain track or a small block itself. The red and black is switched one way or the other by the internal SPDT contacts inside the tortoise and powers the frog of the turnout via the green wire depending on whetaher the motor moves to the left or the right. The power to move the motor comes from the brown and blue wires which come from the accessory decoders or stationary decoders which in my case are Digitrax DS64s and are capable of switching four differently address turnout motors or pairs of motors in the case of cross overs. In my instance on this particular board I have six Tortoise motors all powered from the one accessory decoder DS64.

Hope this all makes sense. Let me know if doesn't or if you are interested in any details specifically and I will post a picture of video to try and help clear up any queries.

Thanks Dave, try to keep it neat but there is an awful lot of wires to go under this 300mm deep board so we will see how neat it looks at the end hey!