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World’s Longest and Deepest Train Tunnel – Gotthard Base Tunnel

As on June 1, 2016, the twin tubes of GBT (Gotthard Base Tunnel) which run from north to south under the famous Alps is world’s longest and deepest train tunnel.

The Project Background
The first thought of building a tunnel under the Alps was given way back in 1947 but the commission started deliberations in 1963. Then in 1992, the Swiss voters gave the go ahead to this project via referendum and the on site work started in 1995. The TBM’s (Tunnel Boring Machines) were deployed to work in 2002 from both the North and South end. In March 2011, the tunnel boring was completed.

Gotthard Base Tunnel Project

The Specifications
1. Total Length of Tunnels and Shafts – 151.840 km
2. Diameter of each of the single-track tubes: 8.83–9.58 m
3. Amount of rock excavated : 28,200,000 tons


AlpTransit Gotthard Ltd. is the company which designed and constructed this project under project’s chief engineer Matthias Neuenschwander guidance.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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