- India’s oldest metro train network.
- India’s 1st underground metro train network.
- Started and run by the Indian Railways.
- Length – 47.165 Kms.
- New sanctioned projects – 87.83 Kms.
- 1st corridor – Dum Dum-Tollygunge route.
- Work started – 29th December 1972.
- 24th Oct 1984. 3.4 Kms track opened.
- With India’s first underwater metro, called its Green Line.
- India’s 1st transportation tunnel under river.
- Green Line – Howrah Maidan to Esplanade – 4.8 kms.
- Green Line’s underground tunnel – 520m long.
- With India’s deepest metro station – at 30m.
- Passes under the Hooghly River.
- Inaugurated – 6th March 2024. Thrown open – 15th March 2024.
