RS822 railway network security architecture implements a multi-layered defense strategy across two AWS availability zones with DMZ, application, management, and telemetry subnets. Internet traffic flows through Route 53, CloudFront CDN, AWS WAF, and ALB before reaching API Gateway and backend services including EMR, SageMaker, Lambda, and Kinesis for big data and AI analytics. Railway operational technology (RTS) systems—interlocking controllers, signaling systems, and IoT Core telemetry—are isolated in dedicated private subnets with Palo Alto NGFW and hardware data diodes enforcing unidirectional data flow. Security operations leverage CyberArk PAM, Splunk SIEM, Cisco ISE, GuardDuty, KMS, and IAM for identity governance, threat detection, and compliance across the entire VPC (10.0.0.0/8). Fork this diagram on Diagrams.so to customize subnets, add additional security controls, or adapt the architecture for your railway or critical infrastructure deployment.