Mumbai Metro
rapid transit system serving the city of Mumbai, Maharashtra, India
The Mumbai Metro is a rapid transit train system serving the city of Mumbai and the wider Mumbai Metropolitan Region in Maharashtra, India.
While the Maharashtra Metro Rail Corporation Limited (Maha Metro) is responsible for all metro rail projects being developed in the rest of Maharashtra, the Mumbai Metropolitan Region Development Authority is the authority responsible for maintaining the metro system in the Greater Mumbai area.
The rapid transit metro system is designed to reduce traffic congestion in the city and supplement the overcrowded Mumbai Suburban Railway network. It is being built in three phases, over 15 years, with overall completion expected in October 2026. The Mumbai Metro is the second longest operational metro network in India with an operational length of 101.43 km (63.03 mi) as of April 2026. When completed, the core system will comprise sixteen high-capacity metro railway lines, spanning a total of more than 523 kilometres (325.0 mi) (25% underground, the rest elevated, with a minuscule portion built at-grade) and serviced by 350 stations.
Blue Line 1 of the Mumbai Metro is operated by Mumbai Metro One Private Limited (MMOPL), a joint venture between Reliance Infrastructure (74%), the Mumbai Metropolitan Region Development Authority (26%) and formerly by RATP Dev Transdev Asia (5%). While lines 2, 4, 5, 6, 7 and their extensions will be built by the Mumbai Metropolitan Region Development Authority (MMRDA) and operated by the Maha Mumbai Metro Operations Corporation Limited (MMMOCL), the completely underground Aqua Line 3 and Green Line 11 will be built by Mumbai Metro Railway Corporation Ltd (MMRC).
In June 2006, Prime Minister Manmohan Singh laid the foundation stone for the first phase of the Mumbai Metro project, although construction work began in February 2008. A successful trial run was conducted in May 2013, and the system's first line commenced operations on 8 June 2014.
Begin with the source’s own compact description: “Mumbai Metro” is rapid transit system serving the city of Mumbai, Maharashtra, India. The dossier treats that line as a proposition to test through Mumbai, Metro and rapid, not as a finished interpretation.
Why this record matters
The phrase “rapid transit system serving the city of Mumbai, Maharashtra, India” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q646414. Authority coordinates are 19.076, 72.877. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2026, 2006, 2008 and 2013.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
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Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
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Questions for further research
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This entry incorporates text from “Mumbai Metro” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.