Kolkata's Blue Line Metro to Undergo Major Track Overhaul After 41 Years
In a significant development for Kolkata's urban transit, the North-South Metro, often hailed as the city's lifeline, is set for a comprehensive track overhaul after 41 years of service. Metro Railway has officially invited tenders for a "thorough rail renewal" project valued at Rs 4.2 crore, targeting 9.1 track kilometers of the Blue Line between Dakshineswar and New Garia (Kavi Subhas station). This initiative marks a critical step in modernizing the aging infrastructure of one of India's oldest metro systems.
Immediate Attention Required for Key Sections
Sources within Metro Railway have disclosed that a specific 3.4 track kilometer section urgently requires restoration, prompting immediate action. The project will involve replacing existing rails with advanced 60 kg rails on ballastless tracks, spanning underground, surface, and elevated segments. The work is scheduled for completion within a strict 12-month timeframe, encompassing tasks such as removal and insertion of rails and fittings, drilling and cutting of rails, epoxy grouting of inserts, and refixing components after lubrication. Additionally, it includes handling, lifting, and transportation of rails, sleepers, and track fittings to ensure seamless execution.
Transition to Modern Ballastless Track Technology
A key aspect of this overhaul is the shift to ballastless track systems, which replace traditional loose stone ballast with a rigid concrete or asphalt base. This modern railway track structure offers enhanced stability, durability, and lower maintenance requirements, while also enabling higher speed capabilities. Officials emphasize that this upgrade is essential as Blue Line trains are currently operating at an average speed of 55 kmph, significantly below the optimal 80 kmph, due to worn-out tracks in several stretches. In some areas, track subsidence has forced motormen to navigate "obstructions" at drastically reduced speeds, highlighting safety and efficiency concerns.
Addressing Ageing Infrastructure and Future Plans
Metro officials clarified that while routine maintenance has been conducted, the natural ageing of the four-decade-old system necessitates this extensive renewal. Beyond the immediate project, Metro Railway is drafting a comprehensive plan for track rehabilitation between Noapara and Tollygunge (Mahanayak Uttam Kumar station), with funds expected to be sanctioned later this year. The complete rehabilitation of the entire 26-kilometer stretch from Dakshineswar to New Garia is projected to take three to four years, aligning with broader efforts to refurbish various systems of the corridor since the closure of the Kavi Subhas terminal station in July last year.
