Kolkata Metro achieves TBM breakthrough on Purple Line (Joka–Esplanade corridor)
Kolkata Metro’s Purple Line completed an underground tunnel drive between Khidderpore and Victoria using TBM “Durga”.
AI generated- The Purple Line includes the Joka–Esplanade Metro Corridor and the Khidderpore–Victoria underground section.
- Tunnel Boring Machine “Durga” achieved a breakthrough at Victoria Metro Station on 11 July 2026.
- Tunnelling on the Khidderpore–Victoria section commenced on 10 July 2025 and reached breakthrough in July 2026.
- Kolkata Metro also bridged a 62-metre viaduct gap at Chingrighata on this corridor within 50 days of the breakthrough milestone cited by the Ministry of Railways.
Kolkata Metro reported a breakthrough by Tunnel Boring Machine “Durga” on the Purple Line, completing one underground tunnel drive between Khidderpore and Victoria on the Joka–Esplanade Metro Corridor. The Ministry of Railways said the breakthrough was achieved on 11 July 2026 and described it as a step in Kolkata’s metro expansion.
This milestone matters because the corridor is intended to improve east-west connectivity in Kolkata, linking the southern parts of the city with the central business district. It also reflects the wider use of underground metro construction to expand urban mass transit while reducing congestion and surface disruption.
What happened
UPSC may link Kolkata Metro’s reported breakthrough on the Purple Line to the role of metro systems in easing congestion, improving last-mile connectivity, and supporting sustainable urban mobility. The topic can also be framed around project execution, inter-agency coordination, and the pace of infrastructure creation in metropolitan cities.
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