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  The Impact of Evolving Requirements for Fire Safety and Emergency Planning on the Configuration of Underground Metro Systems

  Once the demand and route for a Metro system is established, options for tunnel configuration are developed. Whilst civil and systems engineering requirements are project-specific, fire safety and emergency planning objectives remain relatively unchanging across projects. We present the regulatory context followed by case studies from recent projects, where fire safety was a key factor in planning and consents. Each case study addresses requirements for intervention, egress, and ventilation. A key design issue in each example was the potential requirement to restrict operations to a single train per ventilated tunnel section. This constraint may not be necessary if rolling stock is designed such that, in the event of fire on-board, it can continue to a safe area.

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