Kolkata Metro Embarks on Major Electrical Infrastructure Modernization
In a significant move to enhance operational efficiency, the Kolkata Metro Railway has initiated a comprehensive overhaul of its electricity supply system. The country's oldest metro system is set to undergo a major modernization project valued at Rs 345.7 crore, targeting the persistent power issues that have plagued its services.
Addressing Chronic Power Snags on the North-South Corridor
The Metro Railway, which operates Kolkata's rapid transit network, has frequently experienced power disruptions along the crucial New Garia–Dakshineswar corridor. This vital route runs along the city's north–south axis, and the recurring electrical faults have led to service interruptions, inconveniencing daily commuters.
To tackle these challenges head-on, authorities have floated a tender for the complete modernization of the third rail system and 33 KV electric substations. The third rail is the electrified conductor that supplies power for train movement, and its aging infrastructure has been a primary cause of the operational hiccups.
Project Details and Expected Benefits
The comprehensive modernization initiative represents a milestone for the Kolkata Metro. It involves replacing the outdated electrical components with state-of-the-art 33 KV systems. This upgrade is projected to significantly boost power supply reliability, operational efficiency, and overall safety across the entire network.
"One can expect fewer power snags and other issues plaguing the old electrical system, for which services and operations are disrupted every now and then," explained an official from the Metro Railway. The project will specifically focus on upgrading equipment at the 750 V DC traction substations, including the third rail and associated power cables. Additionally, it will involve converting 11 KV auxiliary substations to more robust 33 KV auxiliary substations.
Understanding the Third-Rail System
A third-rail metro system powers underground trains through a continuous, electrified conductor rail positioned alongside or between the running rails. Trains are equipped with collector shoes that make contact with this third rail, typically receiving 750 V DC to operate. This setup is widely regarded as a cost-effective and low-profile solution for urban transit systems, particularly in underground or elevated configurations.
The mechanism relies on metal "shoes" attached to the train bogies, which slide along the energized third rail carrying direct current (DC). This method has been a cornerstone of Kolkata Metro's operations since its inception.
Recent Modernization Efforts and Tender Specifications
This electrical infrastructure upgrade follows another recent modernization project. Earlier this month, Metro General Manager Subhransu Sekhar Mishra flagged off a Rs 585 crore initiative to modernize the air-conditioning and tunnel ventilation systems across 15 underground stations on the Blue Line, covering a 16 km stretch from Belgachhia to Rabindra Sarobar.
The tender for the electrical system overhaul was issued last Friday and follows an open bidding process under a two-packet system. According to the specifications, the contracted work must be completed within three years from the commencement date. Bids are to be submitted between March 6 and March 20, with a validity period of 90 days from the bid closing date. A pre-tender meeting is scheduled for this Friday to address potential queries from interested bidders.
This strategic investment in Kolkata Metro's electrical backbone is poised to transform the commuting experience for millions of passengers, ensuring smoother and more reliable transit across the city's bustling corridors.
