وادي ملوية
Perhaps the most famous and "mysterious" of the gauge narrow-gauge railways in Morocco was the Chemin de Fer Guercif an Outat el Hadj et Midelt. It started from Fes–Oujda line and ran south-west along the Moulouya River valley near the east bank of the river course. The whole railway line was: Guercif–Meski–Fritissa–Tissaf– Outat Oulad el Hadj. This section was completed and opened for military service during World War I in 1918.