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  Challenges in Implementation of Tunnel Ventilation System Upgrade in Singapore North-South and East-West Line Underground Stations

  The North-South and East-West (NSEW) Line of the Singapore Mass Rapid Transit has been in service since 1987. It has 15 underground stations. The increasing demand for shorter train arrival time, increasing expectation on improved system reliability and expectation of better train service. There is a need to renew the existing transit infrastructures to enhance train service reliability and operational safety. With the addition of new trains to boost the capacity of the NSEW line and the upgrading of the new signalling system to reduce train headway from 120s to 90s, there is an increase in train frequency. These provisions enhance the operational resilience, efficiency, and flexibility of the transit system. The existing tunnel ventilation system (TVS) serving the NSEW Line post challenges such as ageing and obsolescence of existing equipment. It is essential to renew and upgrade the TVS to meet the new operational needs. Besides designing the TVS to handle congestion and emergency operations, the TVS is also required to facilitate maintenance works such as track grinding during maintenance work in the tunnel. Unlike greenfield projects, the existing metro operations have numerous constraints in the implementation of TVS renewal works. The utmost importance is no disruptions to metro services. Seamless system changeover and spatial constraints are the challenges in upgrading the existing TVS. Strategically, allowing temporary shutdown part of the TVS while still maintaining TVS operations readiness to handle emergency scenarios such as a fire in the tunnel during the upgrading period.

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