Alstom’s Mumbai Metro Line 4: CBTC & Metropolis Metro Cars

Introduction

Alstom has been awarded a contract by Larsen & Toubro to supply 234 Metropolis metro cars, a Communications-Based Train Control (CBTC) signalling system, and maintenance services for Mumbai Metro Line 4 in India. The contract, announced on August 29, 2025, follows Larsen & Toubro’s award from the Mumbai Metro Regional Development Authority for an Integrated Systems Package for Line 4.

Project Scope and Details

The Integrated Systems Package awarded to Larsen & Toubro includes rolling stock, signalling, telecommunications, platform screen doors, depot machinery, and maintenance services for five years. Mumbai Metro Line 4, also known as the Green Line, will be 35.3km long, connecting Wadala in Central Mumbai to Kasarvadavali in Thane and featuring 32 stations. The project aims to improve connectivity with the Eastern Express Highway, Monorail, and other metro lines in the city.

Manufacturing and Design

The design of the 39 trainsets, each comprising six cars, will be carried out at Alstom’s engineering centre in Bangalore. Manufacturing of the new Metropolis metro cars will take place at the Sri City facility in Andhra Pradesh. Additional components will be produced in Coimbatore, Tamil Nadu, and Savli, Gujarat. The trains will incorporate features such as interior airflow cooling and wheelchair access.

Technology and Services

Alstom will implement its FlexCare Perform maintenance services for five years for the trains. The new driverless trains will utilize Alstom’s CBTC Urbalis technology, which was developed at its Bangalore site. This technology will be integrated into the Operation Control Centre at Mandale depot and will manage train operations across the line.

Statements

Ling Fang, Alstom APAC region president, stated, “We are honoured to be chosen for the prestigious Mumbai Metro Line 4 project, further strengthening our long-standing association with the city of Mumbai. Alstom-built trains and signalling solutions are already serving on other Mumbai Metro lines. This ambitious new project presents more opportunities for us to provide best-in-class solutions to the commuters and contribute to elevating the financial capital’s infrastructure.”

Conclusion

The contract will see Alstom supply metro cars, a signalling system, and maintenance services for Mumbai Metro Line 4. The project will leverage Alstom’s CBTC Urbalis technology and utilize manufacturing facilities across India. The project is designed to improve connectivity and reduce traffic congestion in Mumbai.

Company Summary

Alstom: A company that will supply 234 Metropolis metro cars, a Communications-Based Train Control (CBTC) signalling system, and maintenance services for Mumbai Metro Line 4.

Larsen & Toubro: Awarded by the Mumbai Metro Regional Development Authority to deliver an Integrated Systems Package for Line 4.

Mumbai Metro Regional Development Authority: Awarded a contract to Larsen & Toubro to deliver an Integrated Systems Package for Line 4.

Technology

Communications-Based Train Control (CBTC): A signalling system that Alstom will supply for Mumbai Metro Line 4. Alstom’s CBTC Urbalis technology, developed at its Bangalore site, will facilitate driverless operations and will be integrated into the Operation Control Centre at Mandale depot.