[_jgdh]

For India specifically? The wikipedia articles for each metro, perhaps. They provide a timeline when each was constructed.

https://en.wikipedia.org/wiki/Chennai_Metro

https://en.wikipedia.org/wiki/Delhi_Metro

https://en.wikipedia.org/wiki/Namma_Metro

[readme3]

Hyderabad as well (another IT city) : https://en.wikipedia.org/wiki/Hyderabad_Metro

Smaller ones : https://en.wikipedia.org/wiki/Jaipur_Metro https://en.wikipedia.org/wiki/Kochi_Metro

etc.

[kartickv]

Thanks, but I was looking for an India-wide statistic, like a graph, so I can see how fast (or slow) we're making progress.