Col du Mont d'Orzeires
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|Col du Mont d'Orzeires|
|Elevation||1,060 m (3,478 ft)|
The pass road runs on side road 152a from Le Pont (1008 m a.s.l.), a village in the municipality of L'Abbaye, northeast along lake Brenet, over the Col du Mont d'Orzeires, past Pierre Punex (1061 m a.s.l.) and continues to Chalêt du Mont d'Orzeires (1029 m a.s.l.), where the Juraparc animal park is located. After a few bends, the road runs from a height of 950 m a.s.l. to the east to La Dernier (764 m a.s.l.) and Vallorbe (749 m a.s.l.). The pass connects the Valle de Joux through the narrows between the Risoux range and the Dent de Vaulion (1483 m a.s.l.) with main road 9 near Vallorbe.
The Pont–Vallorbe Railway (Chemin de fer Pont–Vallorbe) built a railway tunnel through the Mont d'Orzeires, which is traversed by the Vallorbe–Le Brassus trains. The tunnel was built in response to a petition from the residents of the valleys of 1867 and opened in 1886. It had a dual function, as it was not only serve the railway but, in the case of an extraordinary flood, it could also be used to empty water from the two lakes.
- L’assemblée populaire de la Vallée (26 January 1868). Rapport sur la question du percement du Mont d'Orzeires entre Le Pont et Vallorbes (in French). Retrieved 1 August 2019.
- "Feuille d'Avis de Lausanne: "Le 1er novembre 1886: les Combiers ont inauguré la voie qui les désenclavera en toute saison"". 24heures.ch (in French). 1 November 2016. Retrieved 1 August 2019.
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