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As you can see on the map if you zoom in a little, the nearest train station is Lus-la-Croix-Haute. The trip from Grenoble takes about an hour and a half, it should appear as a result on the SNCF website, or you can see the timetable here. To reach Vaunières, maybe you could use a taxi or a car rental, I am not able to find any public transport option.
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