The document discusses the event driven real time disruption (RTD) system used on the Victoria Line in London. It describes the challenges of providing timely customer information given the line's high speeds and extensive interchange connections. The system allows control centre operators to select predefined disruption events which then generate associated messages. These messages are transmitted to stations and trains to be dynamically prioritized and displayed based on location. The system provides customers with trusted, journey-specific disruption information to help them make informed travel decisions.