Dropping the official product FAQ that answers some (but not all) frequent question in its FAQ: https://www.cst.ch/en/faq/
My summary, having lived in Switzerland for the last 10+ years:
- Of course actual railways are more efficient. They will continue to be built where possible.
- This is a tunnel network to get the goods into the middle of cities without putting an ever increasing number of trucks onto the city streets to distribute them throughout the city.
- This runs parallel to the Alps, not through them.
My summary, having lived in Switzerland for the last 10+ years:
- Of course actual railways are more efficient. They will continue to be built where possible.
- This is a tunnel network to get the goods into the middle of cities without putting an ever increasing number of trucks onto the city streets to distribute them throughout the city.
- This runs parallel to the Alps, not through them.