I have just got hold of an Ian Allen Book which is a re-print of the Great Western Railway (UK) 1904 rules. I have now read a good half of it and it is very facinating. I really shows how the railway was run who had responsibility for what. I now know ther are far more signals than stop and go, home and distant. Perhaps a bit dry but very intersting. who else reads the rules. Charlie does not count he is the rules .