The 4-metre corridor on the Gotthard route.

In order to further increase the volume of transalpine freight carried by rail rather than road, SBB will on behalf of the federal government upgrade the Gotthard route to a 4-metre corridor by 2020. This allows even semitrailers with a 4-metre headroom to be carried.

The project is an important component of Switzerland's transport policy. In order to create a 4-metre corridor along the entire length of the Gotthard route, some 20 tunnels need to be enlarged and 80 alterations made to platforms, traction current systems, signalling installations and overpasses.