The line between Cusco and Machu Picchu - Ferrocarril Santa Ana - is a narrow gauge line, which boasts a series of five switchbacks called locally 'El Zig-Zag', which enable the train to climb up the steep incline out of Cusco, before it can begin its descent to the Sacred Valley of the Incas and then continue down to Machu Picchu. However, this section of the route (between Cusco San Pedro station and Poroy) - which had been suspended - resumed by Inca Rail from May 2019. Other trains to Machu Picchu leave from Poroy, just outside Cusco, instead.