The Septemvri–Dobrinishte narrow gauge line (Bulgarian: теснолинейка Септември — Добринище tesnolineyka Septemvri — Dobrinishte) is the only operating 760 mm (2 ft 5 15⁄16 in) narrow gauge line in Bulgaria. It is operated by Bulgarian State Railways (BDŽ). The line is actively used with seven passenger trains running per day.