The Bregenz Forest Railway (German: Bregenzerwaldbahn, known colloquially as the Wälderbahn or Wälderbähnle), is an Austriannarrow gauge railway with a track gauge of 760 mm (2 ft 5+15⁄16 in), the so-called Bosnian gauge. It runs through the state of Vorarlberg and from 1902 to 1983 linked Bregenz on Lake Constance with Bezau in the Bregenz Forest on a 35.33 kilometre long railway line. Today only a 5.01 kilometre long section is still worked as a heritage railway. The remaining line has been closed and largely lifted.