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This tour is a visual overview, not the technical reference. The full design documents and source code live in the public IOTtrains repository on GitHub and are kept up to date as the system evolves:

• github.com/adbyrne/IOTtrains — firmware and server source
• SYSTEM_ARCHITECTURE.md — overall architecture, hardware, network design
• MQTT_SPEC.md — the full MQTT topic and payload specification
• YARDMASTER_DESIGN.md — yardmaster role and terminal design
• TIMETABLE_FORMAT.md — timetable data schema
• IMPLEMENTATION_PLAN.md — build phases and session-by-session progress
• NYE_RULES.md — the prototype operating rules sessions run under

The published Northern Lights Subdivision Employee Timetable and C&O East Central passing times are what crews and the dispatcher actually operate against.

For the railroad itself — track plan, benchwork, and construction history — see the rest of this site, starting with Layout Design and Operations.