Metro Railway, Kolkata has replaced the steel third rail with an aluminium third rail over a 4-km stretch of Blue Line between Shyambazar and Central stations on the Down Line. The new rail, visible at stations such as Shyambazar, Shovabazar-Sutanuti, Girish Park, and Mahatma Gandhi Road, marks a significant milestone in metro infrastructure improvement.
Trial and Implementation Timeline:
- Trials: Conducted between September and November 2024 in areas like Girish Park, Maidan sidings, and Central Main Line.
- Full-Scale Replacement: Initiated in December 2024, with 3500 meters replaced that month. The work now targets 4000 meters monthly, aiming for completion of the underground section by August 2025.
Execution Challenges:
The project demands precise execution to prevent delays disrupting metro operations. A detailed planning process, including backup strategies and high-quality materials like M65 pre-mix concrete for pedestals, ensures smooth implementation.
Technical Highlights:
- New rails installed with Glass Reinforced Plastic (GRP) insulators for stability.
- Superior electrical conductivity ensures reduced voltage drops, energy savings, and faster metro acceleration.
- Interconnected with the existing power system using advanced cable and anchor adjustments.
Benefits:
- Energy Efficiency: Reduced system voltage drops save energy, lowering operational costs significantly, with expenses recovered in three years.
- Environmental Impact: Aluminium third rail reduces carbon emissions by 50,000 tons over its lifetime.
- Maintenance Reliability: Eliminates the need for welding during repairs and enhances air quality in tunnels due to reduced heat generation.
Conclusion:
The shift to aluminium third rails in Kolkata Metro signifies a leap towards sustainable urban transport. With substantial energy savings, reduced carbon footprint, and improved operational efficiency, this initiative sets a benchmark for metro systems in India and ensures a smoother, greener commute for Kolkata’s residents.
Source: Kolkata Metro – Press Release | Images Credit: Kolkata Metro
