Most Slovenian railway lines were built during the Austro-Hungarian Empire.
1,000 mm (3 ft 3 3⁄8 in) gauge
Ljubljana tram system; 18,5 km, 1901-1958
760 mm (2 ft 5 15⁄16 in) gauge
Poljčane - Zreče; 20,8 km, closed.
Piran tram system; 5 km 750 V DC electrified tram, 1907-1952
Parenzana railway; Triest - Škofije - Sečovlje border - Poreč, 33 km, 1902-1935.
750 mm (2 ft 5 1⁄2 in) gauge
Kobarid - Pojana border - Cividale del Friuli, 9 km, Società Veneta 1915-1932
620 mm (2 ft 13⁄32 in) gauge
Postojna Cave railway in Postojna; 2,5 km double track, opened in 1872.
600 mm (1 ft 11 5⁄8 in) gauge
Brestanica to the north; 6 km, closed construction railway.
