Shortly after the construction of the Gotthard tunnel, Switzerland pulled off another pioneering achievement: the construction of the Thusis - St. Moritz railway line between 1899 and 1903. This opened the Upper Engadine to tourists. The Rhaetian Railway still passes over the same bridges and through the same loop tunnels. A still greater challenge was the subsequent construction of the Bernina Railway. No other railway in the world overcomes such steep gradients and winds through such steep curves without the help of a cogwheel.

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An excerpt of the film "The Most Beautiful Train in the Alps"