IIT Madras, Kolkata Metro to Pilot Magnetic Propulsion for Urban Trains

In a move that could reshape the future of urban transportation in India, the Kolkata Metro Railway has partnered with IIT Madras to explore the feasibility of Linear Induction Motor (LIM)-based propulsion systems , a technology that enables trains to move using electromagnetic force rather than conventional wheel-driven mechanisms.

The collaboration, formalised through a Memorandum of Understanding (MoU), aims to evaluate the technical viability, operational performance, and lifecycle costs of LIM technology under Indian conditions. Officials said the initiative reflects a broader push towards innovation-driven and indigenous solutions in the country’s rapidly expanding metro rail network.

Unlike traditional metro systems that rely on rotating motors and wheel-rail friction, LIM technology operates on the principle of electromagnetic induction . A motor mounted beneath the train generates a moving magnetic field , which interacts with a metal plate laid along the track. This interaction produces a direct linear thrust , propelling the train forward without relying heavily on physical contact or traction.

Experts note that this design offers significant advantages for dense urban environments. LIM-powered trains can navigate tighter curves and steeper gradients , making them particularly suitable for cities where space constraints limit conventional rail design. The system also reduces dependence on wheel adhesion, allowing more reliable performance in conditions such as rain, dust, or steep inclines.

As part of the project, a pilot programme will retrofit an existing metro coach with LIM technology. This real-world trial is expected to generate crucial data on energy consumption, efficiency, maintenance needs, and system durability . The findings will help determine whether the technology can be scaled for wider deployment across metro corridors.

Officials involved in the project said the study will also examine how LIM systems perform across different track configurations, especially in complex alignments common in Indian cities. The results are expected to support evidence-based decision-making for future metro projects.

While LIM systems offer benefits such as smoother acceleration, reduced mechanical wear, and quieter operation , experts caution that challenges remain. These include higher initial infrastructure requirements , the need for specialised track components, and relatively lower energy efficiency compared to traditional rotary motors.

Despite these limitations, the collaboration is being seen as a significant step toward strengthening India’s capabilities in advanced rail technologies . By leveraging academic research and real-world testing, the partnership with IIT Madras aims to build a foundation for locally developed, future-ready transit solutions .

As Indian cities continue to expand and demand more efficient public transport systems, the success of LIM technology could open new possibilities for designing flexible, cost-effective, and high-performance metro networks across the country.