[ re T gauge (3mm track gauge)]
> Knew a chap who's interest was signalling, never did it for real
> (AFAIK) but had all the books and knew how it all worked (his day
> job was designing PCBs for military projects). He would probably be
> happy with it, providing he could get the signals to work.
>
Assuming he could see the signals, never mind getting them to work...