Park in the large car park at the Touvet funicular railway in Montfort, between Crolles and Lumbin.
(S/E) Go to the funicular station and go around it on the left.
(1) Find the yellow marked trail, begin the climb, and quickly pass the ruins of Château Robert, which is currently undergoing consolidation work. Continue on to the crossroads of the trail coming from Crolles.
(2) Turn right and continue climbing along a boxwood alley, passing the Oule waterfall before crossing the funicular railway line.
(3) Cross, ducking well below the passageway, then begin the numerous tight hairpin bends. The trail leaves the track and then returns to it, running alongside it using the steps parallel to the track. Leave it again for a few metres before reaching the Pal de Fer near the upper funicular station.
(E) Enter the station and, with the appropriate ticket, take one of the funicular carriages to the car park (S).