The green railway line (Carrilet) begins at Estany Gento (2,200 m), where you arrive on foot or by cable car. It is a route without slopes that follows the old railway line and sleepers until the water reservoir of Capdella’s hydroelectric power station (2,136 m). More than 100 years ago they had been used to transport materials to communicate the lakes of the area for the construction of Capdella’s Power Station .

Now it is an appreciated tour for both walkers and mountain bikers in Aigüestortes i Estany de Sant Maurici  National Park.