Narrow gauge railways in Italy
Most narrow-gauge railways in Italy were built with Italian metre gauge, which is actually 950 mm (3 ft 1 3⁄8 in) because historically the Italian track gauge was defined from the centres of the rail instead of the internationally accepted method of measuring the gauge from the inside edges of the rails. Several metre-gauge lines were built in northern Italy.
123 km 1,000 mm (3 ft 3 3⁄8 in) gauge (123 km electrified); 1,290 km 950 mm (3 ft 1 3⁄8 in) gauge (151 km electrified); 231 km 850 mm (2 ft 9 15⁄32 in) gauge (2008)
1,200 mm (3 ft 11 1⁄4 in) narrow-gauge railways in Italy are:
The temporary Mont Cenis Railway (1868–1871) was 1,100 mm (3 ft 7 5⁄16 in) gauge.
Most in Southern Italy
In Calabria there is the Catanzaro Lido–Catanzaro–Cosenza line, with a branch to Camigliatello Silano, and two lines from Gioia Tauro. All are owned by Ferrovie della Calabria.
The Rome–Fiuggi railway is a former railway built on the east part of Rome, Italy. It consisted of a 78.1 kilometers (48.5 mi) long narrow-gauge 950 mm (3 ft 1 3⁄8 in) line from Rome to Fiuggi.
...
Wikipedia