Immediately after Chedde, the line goes into steep slopes, which quickly reach the record value of 90 mm/m (9 %). Indeed, it needs to climb up a gorge in a tough environnement. The road faces the same conditions, and in the 1970s an elevated expressway was built above the Chedde chemical plant: the Égratz viaduct. The railway climbs under the viaduct on some distance, up to Égratz tunnel that crosses a rocky spur. The railway then continues its 90 mm/m ascent.
Ascent under viaduc des Égratz After Chedde, the track climbs a steep slope. We can see the piles of the viaduct in the background. the track passes near the chemical plant. In the background, one can see the Égratz viaduct. A Z 850 EMU runs along the chemical plant in Chedde. A Z 850 EMU runs along the chemical plant in Chedde. At kilometer marker 4.409, the track crosses the Arve on Pont des Égratz, a metal bridge, and then a tunnel goes through a rocky ridge. The feeder goes over the ridge. The expressway climbs on its right. Auteur : David Gubler. Close-up of the the railway bridge at Les Égratz.
