My favorite, when the conditions are right, is the 3.5-mile run down the Albula Pass road outside of Bergun.

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During the winter months, the Albula mountain pass closes to car traffic and the road gets taken over by schussing wooden toboggans.

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You name it, they have run a railway up it, by hook or by crook, by rack or by pinion and by Albula and St Moritz.

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In the Albula Valley the track spirals to gain height, and around the austere grandeur of the Bernina Pass becomes one of the world's steepest narrow-gauge railways.

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But the Albula steepens quickly, and the river disappears into a dramatic ravine, forcing the train to criss-cross the gorge, creaking like a sailing ship in a full-bellied wind.

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The personal-injury lawyers would have a field day with this twisting, icy run, which follows the roadway over the Albula Pass connecting central Switzerland with the Engadine Valley, home of the famous St.

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Its journey begins as it departs from the platform at Chur, the oldest town in Switzerland, where it makes a modest start alongside the baby Rhine and continues into the lower part of the Albula valley.

BBC: Full steam ahead