Thanks Caiptean, Yes, I realise there is a lot more to it for a novice to understand. That's why I'd like to learn more and get it correct. Your answers so far are a big help. My layout is just the standard Hornby trakmat, 6x4. Not too much going on, but I'd like to get it as close to real world as possible with such a small, basic layout. Thanks Kev.