Spiral tunnels and tunnels on a curved alignment

Lists of spiral (helicoidal) tunnels and tunnels on a curved alignment on railway lines worldwide.

A part of a line is bracketed (), if it is located in a country other than that mentioned in the specific table:

Example: :(Lausanne – Montreux – Sierre – Visp – Brig – ) → Switzerland

The turn tunnels in the following table are sorted from West to East according to the location of the start point of the line.

Locations partly from: