It cuts the Zürich-Milan journey time for passenger trains by about an hour (from 173 to 111 minutes) accelerating train trips from Germany/Switzerland to Italy significantly.
I don't get this. Zurich is in Switzerland. I don't think even with this tunnel opening we will be getting from Zurich to Milan in under 2 hours... Are your numbers wrong?
Edit: we will be looking at journey times of about 170 minutes from Zurich to Milan AFTER the tunnel opens.
Self-correction: It cuts the Zürich-Lugano journey time from 173 to 111 minutes rather than Zürich-Milan (which still takes longer). Though it does cut journey times for the latter by an hour too.
[1]: https://en.wikipedia.org/wiki/Ceneri_Base_Tunnel