The Commissioner of Metro Rail Safety (CMRS) has commenced an inspection of Corridor Four of Chennai Metro Phase Two, officials said. The inspection is part of statutory safety certification required before any corridor is approved for commercial operations and covers structural works, track laying and platform readiness. The inspection aims to verify that construction quality and safety management meet statutory norms. Chennai Metro Rail Limited (CMRL) has prepared the corridor for review, completing civil works and system integration. The inspection team is assessing signalling and telecommunications, power supply, traction and auxiliary systems, station systems and passenger amenities. Tests include trials of safety interlocks, emergency response systems and compatibility checks between rolling stock and track infrastructure. Officials indicated that any observations will be documented for rectification, and reporting mechanisms will record technical discrepancies and prioritise remedial work to ensure timely compliance. The CMRS review process involves detailed inspection of elevated and underground sections, ventilation, fire detection and suppression, as well as accessibility features for persons with reduced mobility. Trial runs and dynamic tests form part of the assessment to ensure operations meet regulatory safety thresholds. CMRS will evaluate documentation, maintenance protocols and staff training records as part of the comprehensive appraisal. The review will also consider operational readiness including signalling staff preparedness and contingency procedures. Following completion of the inspection, CMRS will issue a report outlining findings and recommending any remedial actions, after which CMRS may grant a safety certificate subject to compliance. Once certification is received, Chennai Metro Phase Two Corridor Four could move towards commercial operations, enhancing urban connectivity and reducing road congestion. Local authorities and CMRL will coordinate on communication to commuters regarding any service changes during final commissioning. Authorities expect the corridor to improve commuter options and support sustainable urban transport objectives.