Failing to isolate engineering systems from passenger entertainment systems that could provide hackers with access to critical systems This system contained many of the poor security protections common to real rail systems. In addition to the standard security vulnerabilities that cyber-physical systems experience, those in railway systems have more. Build security into the design of every system, ideally on multiple levels; when systems are procured, ensure that their security is strong. Isolate critical systems from passenger-facing systems, so that easy-to-access passenger systems cannot be used as gateways into critical ones. Cybersecuring railway systems from potential attackers must become paramount in the digitization that those systems currently undergo.