I have managed to get it working, although the website is rather clunky. The register button was greyed out but I clicked it anyway, it let me. The confirmation email got marked as Spam by my Gmail but I got it working in the end. It is very engaging, I was heavily using something called SimSig a few years ago but this one is better and has a dozens of maps other people have built and you can create your own, although I have yet to try that. This is mainly a signalling simulator so you are in the role of being in the signalbox and setting train paths and changing the points etc.
The maps here are too detailed for a public-facing network map that just shows the passenger stations etc.
Kind regards,
Gary