PC-Rail are pretty much the best and certainly the most comprehensive signalling sims that I have come across ... I have friends who have no particular interest in railways who have been quite fascinated by PC-Rail when they have seen the sims on my computer and I hope they have been prompted to try them out.
Our simulations are run using the PC-Rail Plus software. Please make sure you are using a recent version - the latest is dated 21/08/26
and you can update free of charge.