January 5, 2010
each tunnel's portals will be custom made when necessary.
thus the northern portal of the gotthard tunnel itself has two tubes at the entrance which join and become one after a very short distance.
if so inclined, you can watch a cab ride video of the journey through the whole 15 km long tunnel on alpentunnel.de.
the video called "Führerstandsfahrt Amsteg - Airolo" of course not only covers the ride through the tunnel, but also the climb up from erstfeld to göschenen.
here is a direct link if you do not speak german, be careful its 362 mb.