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Last edited 20 Jun 2017
East West Metro Tunnel, Calcutta
It has taken almost a century to realise Sir Dalrymple-Hay concept, and it is expected that the East West Metro Railway will have a significant and far reaching impact on Calcutta's transportation system in years to come and the way people commute between these two congested city centres.
The entire stretch is divided into three parts:
- UG-1 (underground portion from Howrah Maidan to New Mahakaran).
- UG-2 (underground portion from Esplanade to Subhash Sarobar).
- Elevated portion from Subhash Sarobar to Salt Lake Sector-V.
The works include 2-tier Howrah Maidan Station, one cross-over near Howrah Maidan Station, a 4-tier Howrah Station adjacent to present Howrah Railway Station (Kolkata's Railway Hub to rest of India) to provide interface between underground and surface railway transportation for commuter traffic coming to the cities from suburbs.
The tunnel is being constructed with pre-cast segments (5 regular segments and 1 key) of M50 grade concrete along with all necessary arrangement to ensure waterproofing, resistance to earthquake and flotation for a design life of 120 years.
During tunnelling (other than utilities and land issues), the biggest challenge is to ensure the safety of buildings and structures above ground (some of them are almost a century old and remnants of the colonial era) with suitable preventive measures.
This article was originally published here by ICE on 15 June 2017. It was written by Ayanangshu Dey.
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