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Thane commuters moved a step closer to Metro rides as the Commissioner of Metro Railway Safety cleared rolling stock for Mumbai Metro Line 4 and 4A on August 28, 2026. The first passenger services are expected on the Gaimukh–Cadbury corridor. Six rakes and an interim pit line at Gaimukh will handle stabling and maintenance, easing Ghodbunder bottlenecks.
The safety nod follows June’s Research Designs and Standards Organisation certification for Phase 1, which closed a key technical loop after extensive testing. CMRS also inspected the Gaimukh pit line on August 22, with its report awaited. For launch, BEML trains redeployed from Lines 2A and 7 may operate until new L&T–Alstom sets arrive.
Mumbai Metro Line 4/4A safety clearance and first section
The priority section spans 10.5 km with stations from Cadbury Junction to Gaimukh, trimming end‑to‑end travel to about 15 minutes. Interchanges are baked into the blueprint: Gandhi Nagar links with Metro Line 6 later, while Dongripada ties into the planned Thane Ring Metro. That design improves crosstown options as more corridors open.
| What’s cleared | What’s pending |
|---|---|
| CMRS safety nod for rolling stock; RDSO certification for Phase 1. | CMRS sectional sanction after inspections; Independent Safety Assessor certifications. |
| Gaimukh pit line readiness for stabling and upkeep. | Fire NOCs, lift permissions, fare fixation, and final integrated testing. |
Before passenger rollout, CMRS must sanction the section and stations after integrated testing. Documentation shows parallel tasks like fire clearances and platform screen door safety audits. MMRDA’s multi‑modal integration programme is aligning feeder bays and wayfinding, priming BEST and Thane Municipal Transport loops at Gaimukh and Cadbury for last‑mile flow.
CMRS approvals, feeder links, and crowd plan
Officials are eyeing a commissioning window around November 2026, contingent on timely certifications and trial closures. A Diwali‑season readiness push remains possible if the safety report lands early. Opening day will prioritise crowd metering, guided queues, and staggered headcounts at Gaimukh, supported by feeder staging. Exact frequencies will be set post‑sanction and rake allocation.
For daily riders, the immediate win is dependable Thane–Ghodbunder connectivity and quicker hospital, school, and office hops. As Line 4/4A grows and interchanges switch on, east‑west trips should untangle further. Watch MMRDA advisories for the sanction date, first‑week timetable, and feeder routes to plan seamless station approaches and avoid opening‑day snarl‑ups.