Green Line CBTC Signalling & Automatic Train Operation (Kolkata Metro)
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Kolkata's newest metro line has run on automation-ready signalling since 2024 — but the safety clearance to actually switch on automatic train operation was still pending in mid-2026.
what does this mean?
The strongest source is press reporting; no primary evaluation was located. It grades who did the looking — not how well the project went. All four grades →Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 6 more in Kolkata · 🚌 Public transport guide · 🚲 Mobility projects
India's oldest metro network added Communications-Based Train Control to its newest corridor, the Green Line (East-West Line), which opened in phases from March 2024 and includes a 520-metre tunnel under the Hooghly River. Hitachi Rail STS India built the CBTC system to Grade of Automation 2 for KMRC — trains run under continuous automatic protection and operation, but a driver stays aboard to close doors and start the train, not the fully "driverless" service some 2026 coverage implies. Metro Railway, Kolkata has been trial-running Automatic Train Operation on the corridor since August 2025, and the Commissioner of Railway Safety carried out a final inspection in July 2026 — but as of that inspection, formal clearance to actually run in automatic mode was still pending.
🎓 Lesson
A metro line can run for years on automation-ready signalling before it is actually cleared to operate automatically — the infrastructure and the safety certification are different projects with different timelines.
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1001 Smart Cities (2026). “Green Line CBTC Signalling & Automatic Train Operation (Kolkata Metro)” — Kolkata, India. The Smart City Atlas. https://1001smartcities.org/projects/kolkata-metro-green-line-cbtc-ato/ (last verified 2026-08-02). Data: CC BY 4.0.
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