Thanks Granarog, I did some work here around the turn of the century for the Dartford Area Resignalling project. I had to design an interface between the mechanical token instrument that controlled the single line and a solid state interlocking.
The next one is just for fun, Mrs Stewie and myself on a day out a few years ago, but where were we?
I shall be at the footie this afternoon and out this evening so may be unable to respond straight away!