The tunnel ventilation system of the underground stretch of the north-south corridor (Blue Line), Calcutta’s oldest and most popular Metro link, is being overhauled. Fifteen underground stations between Belgachia and Rabindra Sarobar will be part of the facelift. Air-cooled chiller to be installed on the Blue LineNew fansThe transition involves installing powerful ventilation fans and switching from a water-based cooling system to an air-based cooling system, among several other improvements. From water to airCurrently, the stations have cooling towers on the roofs that condense groundwater to provide cool air to the platforms. A majority of the underground stations pass through boroughs VII and VIII of the Kolkata Municipal Corporation.

Source: The Telegraph February 05, 2026 02:30 UTC