Jump to content
Your browser is out of date. It has known security flaws and may not display all features of this websites. Learn how to update your browser[Close]

Timetable concerns


Transport ministry refutes Gotthard wind resistance claims


By swissinfo.ch


Saint Barbara, the patron saint of miners, at the entrance of the Gotthard Basis Tunnel near Erstfeld, canton Uri. Aerodynamicists might have to start looking for a patron saint soon (Keystone)

Saint Barbara, the patron saint of miners, at the entrance of the Gotthard Basis Tunnel near Erstfeld, canton Uri. Aerodynamicists might have to start looking for a patron saint soon

(Keystone)

The Federal Office of Transport has denied claims that greater wind resistance than expected will slow down trains in the Gotthard Base Tunnel and alter planned timetables. 

"Test trips show that passenger trains travel at the planned speeds of 200km/hour (125mph) and that the planned times can be adhered to," the transport office said in a statement after the NZZ am Sonntag newspaper reported wind resistance problems on September 4.

The newspaper had reported that a physical phenomenon apparently overlooked by engineers would restrict trains running through the longest rail tunnel in the world to a top speed of only 160-180km/h.

Air columns are the cause of the potential problem cited by the paper. Out in the open these air flows created by every moving body can easily escape sideways or upwards. In a tunnel there isn’t much room – especially in the 57km (35.5-mile) Gotthard, which for economic reasons was built almost 10% narrower than the Lötschberg Tunnel for example.

The air columns must therefore be moved along both one-way tunnels by the trains – which requires a lot of energy. “In this case the trains act like pistons in a bike pump,” an engineer told the NZZ am Sonntag.

The problem is exacerbated by slow goods trains which also use the tunnel but have a top speed of only 100km/h. These take 41 minutes to get through the tunnel compared with around 19 minutes for passenger trains.

However, the transport ministry said that "the air flow conditions in the Gotthard Base Tunnel correspond with the calculations" and that "the planned offering in the Gotthard tunnel is safe to carry out".

Sign up for our free newsletter and get the top stories delivered to your inbox.


swissinfo.ch

Copyright

All rights reserved. The content of the website by swissinfo.ch is copyrighted. It is intended for private use only. Any other use of the website content beyond the use stipulated above, particularly the distribution, modification, transmission, storage and copying requires prior written consent of swissinfo.ch. Should you be interested in any such use of the website content, please contact us via contact@swissinfo.ch.

As regards the use for private purposes, it is only permitted to use a hyperlink to specific content, and to place it on your own website or a website of third parties. The swissinfo.ch website content may only be embedded in an ad-free environment without any modifications. Specifically applying to all software, folders, data and their content provided for download by the swissinfo.ch website, a basic, non-exclusive and non-transferable license is granted that is restricted to the one-time downloading and saving of said data on private devices. All other rights remain the property of swissinfo.ch. In particular, any sale or commercial use of these data is prohibited.

×