Corridors

Corridor 3 – Madhavaram to SIPCOT

• Length: 45.8 km
• General orientation: North–South
• Serves areas including Purasaiwalkam, Mylapore, Adyar and the IT Corridor.

Corridor 4 – Lighthouse to Poonamallee Bypass

• Length: 26.1 km
• General orientation: East–West
• Serves areas including Nandanam, T. Nagar, Vadapalani, Porur and Poonamallee.

Corridor 5 – Madhavaram to Sholinganallur

• Length: 47.0 km

Together these make up the official 118.9 km Phase II network.

Chennai Metro Rail Phase II is a major expansion of Chennai’s urban rapid transit network being implemented by Chennai Metro Rail Limited (CMRL). The project comprises approximately 118.9 km of new metro infrastructure across three corridors connecting Madhavaram, SIPCOT, Lighthouse, Poonamallee Bypass and Sholinganallur.

The programme includes both underground and elevated sections, new metro stations, depots, ballastless track, traction power, overhead electrification, signalling and train control, telecommunications, station systems and driverless rolling stock.

Phase II will significantly expand metro coverage across the Chennai Metropolitan Area, including important residential, commercial and technology districts. The network is being designed for Unattended Train Operation (UTO), with major civil and railway systems contracts under construction and implementation.

The estimated project cost is ₹63,246 crore including interest during construction, with completion of the overall Phase II programme targeted by the end of 2028.

Funding

This is particularly useful for the Railbays project record because there are several major international financing institutions involved.

Funding organisations include:

• Government of India
• Government of Tamil Nadu
• Japan International Cooperation Agency (JICA)
• Asian Development Bank (ADB)
• Asian Infrastructure Investment Bank (AIIB)
• New Development Bank (NDB)

CMRL states that 52.01 km covering sections of Corridors 3 and 5 is tied to JICA financing, while the remaining 66.89 km covering Corridor 4 and sections of Corridors 3 and 5 is associated with multilateral financing.

ADB’s financing alone is substantial. Its multitranche facility totals $780 million, including an initial $350 million tranche and a further $240 million loan approved in December 2025.

General Consultants

These should definitely be entered into our Companies Involved relationship.

GC1 – JICA-funded 52.01 km

Consortium:

• Nippon Koei India Pvt. Ltd.
• Aarvee Associates Architects Engineers & Consultants Pvt. Ltd.
• Balaji Railroad Systems Pvt. Ltd. (BARSYL)

Role: General Consultant – GC1

GC2 – Remaining 66.89 km

JV:

• AECOM India Pvt. Ltd.
• Oriental Consultants Global Co. Ltd.
• Nippon Koei Co. Ltd.

Role: General Consultant – GC2

These appointments are confirmed by CMRL.

Major Civil Contractors

There are numerous packages, so I would not try to put every contractor into the first project entry. We can gradually build the complete package database.

Two particularly significant confirmed contractors are:

Tata Projects Limited

Role:

Civil Contractor – Corridor 3 underground works / CP30

Scope includes approximately 9 km of twin-bored tunnels and associated underground station works.

Contract value:
₹2,293.88 crore

Larsen & Toubro Limited (L&T)

Role:

Civil & Track Contractor

Among its contracts is CP31/TU02, involving approximately 12 km of twin-bored tunnels and associated station structures.

Contract value for that package:
₹2,732.20 crore.

L&T also holds the CP18A-ATW-09 track contract for Corridor 3, covering supply, installation, testing and commissioning of standard-gauge ballastless track from Madhavaram Milk Colony to Sholinganallur.

Rolling Stock

Supplier: Alstom Transport India Limited

Technology: Standard-gauge metro EMUs

Operation: Driverless / UTO

Alstom has secured the Phase II rolling-stock packages. For example, CMRL confirmed the third and final Phase II rolling-stock contract in June 2025 for:

32 × 3-car UTO trains = 96 cars

Contract value:

₹1,538.35 crore

CMRL states that this third award completed the rolling-stock procurement requirements for Phase II.

Earlier contracts include 26 three-car trains and 36 three-car UTO trains.

Therefore for our database:

Signalling & Train Control

This is another important company relationship.

Contractor:
Hitachi Rail STS SPA / Hitachi Rail STS India Pvt Ltd consortium

Role:
Signalling, Train Control & Video Management Systems Contractor

Contract Value:
₹1,620 crore

The contract covers signalling, train control and video management for the Phase II network and is designed for driverless UTO operation. CMRL’s contract announcement describes a scope covering 118 route-km, two depots, 113 stations, 138 trains and three maintenance rail vehicles.

Power & OHE

A recent contract is also worth recording.

Company: Linxon India Private Limited

Role: Traction Power / OHE / SCADA Contractor

Package: C3&5-PS&OHE-10

Scope includes:

Receiving substations, auxiliary substations, SCADA, overhead electrification and switching stations for sections of Corridors 3 and 5.

The contract was recorded by ADB in May 2026 at approximately US$43.32 million.

Suggested Railbays Company Relationships

For the initial entry I’d add these:

There are many more package contractors that we can subsequently associate with this project; CMRL’s current awarded-tender database remains active and includes awards into 2026.

118.9 km expansion of the Chennai Metro network comprising three new corridors and 128 stations, including underground and elevated infrastructure and driverless metro operation.