The opening of the world’s longest rail tunnel is set to take place as planned on 1 June 2016.
The CHF12.2bn ($12.3bn) Gotthard base tunnel, which measures 57km in length, runs under the Swiss Alps and is designed to reduce travel times across Europe.
Construction of the tunnel started in 1999, 17 years ago, and since then 28.2m tonnes of mountain rock has been excavated during the tunneling works.
Trains will be able to travel in the tunnel at speeds of up to 250km per hour, reducing the journey times between Zurich and Milan from more than four hours to just two-and-a-half hours.
* Data provided by Timetric's Construction Intelligence Center.