Track gauge in Italy

Historically, Italy had two unusual dominant track gauges which were legally defined depending on the terrain encountered. The gauge of 1,445 mm (4 ft 8+7⁄8 in) was used for the national Italian rail network and was very similar to the 1,435 mm (4 ft 8+1⁄2 in) standard gauge commonly used elsewhere in the world.

Track gauge
By transport mode
By size (list)
Minimum
  Minimum
  Fifteen inch 381 mm (15 in)
Narrow
 
  • 600 mm
  • 610 mm
  • 686 mm
  • (1 ft 11+5⁄8 in)
  • (2 ft)
  • (2 ft 3 in)
 
  • 750 mm
  • 760 mm
  • 762 mm
  • (2 ft 5+1⁄2 in)
  • (2 ft 5+15⁄16 in)
  • (2 ft 6 in)
 
  • 891 mm
  • 900 mm
  • 914 mm
  • 950 mm
  • (2 ft 11+3⁄32 in)
  • (2 ft 11+7⁄16 in)
  • (3 ft)
  • (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 0 in)
  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
 
  • 1,445 mm
  • 1,450 mm
  • (4 ft 8+7⁄8 in)
  • (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)
 
  • 1,520 mm
  • 1,524 mm
  • (4 ft 11+27⁄32 in)
  • (5 ft)
 
  • 1,581 mm
  • 1,588 mm
  • 1,600 mm
  • (5 ft 2+1⁄4 in)
  • (5 ft 2+1⁄2 in)
  • (5 ft 3 in)
  Baltimore gauge 1,638 mm (5 ft 4+1⁄2 in)
 
  • 1,668 mm
  • 1,676 mm
  • (5 ft 5+21⁄32 in)
  • (5 ft 6 in)
  Six foot 1,829 mm (6 ft)
  Brunel 2,140 mm (7 ft 1⁄4 in)
Change of gauge
By location

Since the 1930s, the 1,435 mm gauge has been adopted as the standard and gradually replaced the 1,445 mm track gauge. Thus, in Italy, only a few older tram systems, such as the Milanese tramway network, remain equipped with 1,445 mm.

The other popular gauge, a narrow gauge, was defined at 950 mm (3 ft 1+3⁄8 in) and is very similar to the metre gauge – 1,000 mm (3 ft 3+3⁄8 in) – commonly used in many other parts of Europe and thus came to be known as "the Italian metre gauge".

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