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Minimum   Fifteen inch 381 mm (15 in)   Narrow   600 mm 600 mm (1 ft 11+5⁄8 in) Two foot 610 mm (2 ft) Two foot three inch 686 mm (2 ft 3 in)   750 mm 750 mm (2 ft 5+1⁄2 in) Bosnian gauge 760 mm (2 ft 5+15⁄16 in) Two foot six inch 762 mm (2 ft 6 in)   Swedish three foot 891 mm (2 ft 11+3⁄32 in) 900 mm 900 mm (2 ft 11+7⁄16 in) Three foot 914 mm (3 ft) Italian metre 950 mm (3 ft1+13⁄32 in)   Metre 1,000 mm (3 ft 3+3⁄8 in)   Three foot six inch 1,067 mm (3 ft 6 in)   Four foot 1,219 mm (4 ft)   Four foot six inch 1,372 mm (4 ft 6 in)   1432 mm 1,432 mm (4 ft 8+3⁄8 in)   Standard 1,435 mm (4 ft 8+1⁄2 in)   Broad   Italian broad gauge 1,445 mm (4 ft 8+7⁄8 in) Dresden gauge 1,450 mm (4 ft 9+3⁄32 in)   Leipzig gauge 1,458 mm (4 ft 9+13⁄32 in)   Toronto gauge 1,495 mm (4 ft 10+7⁄8 in)   1520 mm 1,520 mm (4 ft 11+27⁄32 in) Five foot 1,524 mm (5 ft)   Pennsylvania gauge 1,581 mm (5 ft 2+1⁄4 in) Pennsylvania gauge 1,588 mm (5 ft 2+1⁄2 in) Five foot three inch 1,600 mm (5 ft 3 in)   Baltimore gauge 1,638 mm (5 ft 4+1⁄2 in)   Iberian gauge 1,668 mm (5 ft 5+21⁄32 in) Five foot six inch 1,676 mm (5 ft 6 in)   Six foot 1,829 mm (6 ft)   Brunel 2,140 mm (7 ft 1⁄4 in)   Breitspurbahn 3,000 mm (9 ft 101⁄8 in)
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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]

1,200 mm (3 ft 11+1⁄4 in) narrow-gauge railways in Italy are:

• Central Funicular in Naples
• Gardena Ronda Express

The temporary Mont Cenis Railway (1868–1871) was 1,100 mm (3 ft 7+5⁄16 in) gauge.

• Domodossola–Locarno railway between Domodossola, and Locarno, Switzerland.
• Ferrovia Genova–Casella in Genoa, Liguria.
• Laas-Lasa freight private railway to a marble cave, that uses a funicular.
• Mendel Funicular connecting the Überetsch plateau with the Mendel Pass.
• Trieste–Opicina tramway, with a funicular, in the city of Trieste.
• Rittnerbahn, or Ferrovia del Renon. in South Tyrol.
• Trento–Malè–Marilleva railway In Trentino only the lines from Trento to Malè and Marilleva are still operated by Trentino Trasporti. Recently the line has been renovated and extended to Fucine.

Most in Southern Italy

In Calabria there is the Cosenza–Catanzaro Lido railway, with a branch to San Giovanni in Fiore, and two lines from Gioia Tauro. All are owned by Ferrovie della Calabria.

• Circumvesuviana in the Eastern quadrant of the metropolitan area of Naples, connecting Naples and Sorrento, around the base of Mt. Vesuvius,

• The Rome–Giardinetti railway, in eastern Rome, still operates in 2021. It is the last operational segment of a much longer 950-mm gauge line, the 78.1-kilometre (48.5 mi) Rome–Fiuggi–Alatri–Frosinone railway.

In Sardinia, a network of narrow-gauge lines (950 mm / 3 ft 1+3⁄8 in) was built, to complement the standard-gauge main network which covered the main cities and ports. The lines were:

Of the lines which are still present, only

still carry regular passenger services, operated by Ferrovie della Sardegna.^[2] The others only operate a scenic tourist service known as Trenino Verde (little green train)

In Sassari, the Sassari Tram-train (or Metrosassari) is a 950mm-gauge tramway linking the railway station with the city centre.

In Sicily, the Ferrovia Circumetnea railway runs around the Mount Etna. Other 950 mm (3 ft 1+3⁄8 in) narrow-gauge lines of Ferrovie dello Stato operated, but are now closed. The last of which was the Castelvetrano–Porto Empedocle, closed in 1985.

In the Apulia and Basilicata regions, there are some railway lines connecting Bari, Potenza, Matera, and Avigliano. These are operated by Ferrovie Apulo Lucane.^[3]

• Menaggio–Porlezza railway in the northern Italian province of Como, closed in 1939.

• In Istria, a 760 mm (2 ft 5+15⁄16 in) narrow-gauge railway line called Parenzana was built from Trieste – Capodistria now Koper Slovenia – to Parenzo now Poreč Croatia (dismantled 1935).
• Val Gardena Railway in the Dolomites of northern Italy, closed in 1960.

In South Tyrol there are two tourist lines using 600 mm (1 ft 11+5⁄8 in) gauge trains.

• History of rail transport in Italy
• Rail transport in Italy

Media related to Narrow gauge railways in Italy at Wikimedia Commons