For German speakers: https://www.estw-simulator.de/index.html https://www.estw-simulator.de/index.html https://www.estwsim.de/cms/index.php https://www.estwsim.

For German speakers: https://www.estw-simulator.de/index.html https://www.estw-simulator.de/index.html https://www.estwsim.de/cms/index.php https://www.estwsim.de/cms/index.php These have been around for a while and quite closely mimic (slightly older) German signalling specifications for signaller interfaces. My company builds such systems as test and demonstration systems for real railway projects with respective functional safety constraints. If you're interested to learn more about the signalling infrastructure in Europe or Germany, feel free to ask.