Thanks for that Goetz, I have looked there but I expected a list of manufactures, for example, "Peco, Wren, Hornby etc.
Well, perhaps not Hornby as I don't know if it is sold in Germany.
Whilst I am here do you know of any small radius curved rails as the ones I have found are a little large also are there different ones, for example, 1st, 2nd radius to allow for a double-track system.
Sorry for all the questions.
Eric