Chennai Metro (CMRL) completing the Intermediate Overhauling (IOH) cycle for its Phase 1 trains

Chennai Metro Rail Limited (CMRL) has been operating metro train services since 2015 with a fleet of 52 four-car trains. Passenger safety, comfort, and punctuality remain CMRL’s top priorities. To ensure this, all metro trains undergo regular and planned maintenance at fixed interval

Intermediate Overhauling (IOH)
- Conducted once before major overhauling.
- Involves complete dismantling and inspection of trains.

Key processes:
- Removal and examination of wheels, suspension systems, axles.
- Replacement of worn-out components.
- Wheel reshaping for smoother rides.
- Advanced defect detection methods for axles.
- Servicing of brakes, electrical systems, and air-conditioning units.
- Deep cleaning of interiors/exteriors with eco-friendly materials.

Safety & Certification
- After reassembly, trains undergo:
- Stationary tests.
- Trial runs at varying speeds on test tracks and main lines. - Certified fit for passenger service only after meeting all standards.

Milestone Achievement
- Completion of IOH for the 52nd and final train marks the end of the scheduled overhaul cycle for the entire fleet.
- Reinforces CMRL’s commitment to safe, reliable, and world-class metro services for Chennai.

Flag-off Ceremony
- The 52nd train was flagged off for revenue service by Thiru. Manoj Goyal, Director (Systems and Operations).
- Attended by senior officials including Thiru. A.R. Rajendran (Chief GM, Rolling Stock), Thiru. Gopinath Mallya (Chief Advisor), Thiru. Ramasubbu (Advisor O&RS), and other staff.

Significance
- Ensures long-term reliability of the metro fleet.
- Enhances passenger safety and comfort.
- Demonstrates CMRL’s systematic approach to maintenance and global standards in metro operations.