It is not only the Swiss main line railways that are benefitting from tunnel investment. The Rhätische Bahn (or Rhaetian Railway) is an extensive metre-gauge network in the southeast of the country. The section from Tirano (in Italy) to Tiefencastel via Pontresina has been declared a UNESCO World Heritage site, and it is easy to see why. With origins dating back to 1889, the line was initially...

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