Track gauge
By transport mode
By size (list)
Graphic list of track gauges
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
World map, rail gauge by region

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.

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".

The Milan tramway network, the largest in Italy, runs on Italian broad gauge.

Italian law has defined its track gauges in terms of the distance between the centres of each rail,[1] rather than the inside edges of the rails, giving some unusual measurements. According to the law of 28 July 1879, the only legal gauges in Italy were 1,500 mm (4 ft 11+1⁄16 in), 1,000 mm (3 ft 3+3⁄8 in), measured between the rail centres, which correspond to 1,445 mm (4 ft 8+7⁄8 in) and 950 mm (3 ft 1+3⁄8 in) between the rail inside edges.

The narrower gauge has 1,000 mm between the centres of the rails, which explains the name Italian metre gauge, but it is 950 mm in gauge when measured from the inside of the rails, as gauges are normally measured in other countries.

A disadvantage of measuring from the centre of the rail is that the width of the rail varies and affects the gauge. It is easier and more reliable to measure from the inner edges of the rails.

1,445 mm (4 ft 8+7⁄8 in) gauge railways

The following 1,445 mm (4 ft 8+7⁄8 in) systems survive today:

Outside Italy, the Madrid Metro also uses this gauge.

1,435 mm (4 ft 8+1⁄2 in) or standard gauge railways

The Italian standard gauge railway system has a total length[2] of 24,227 km (15,054 mi) of which active lines are 16,723 km (10,391 mi).[3] The network is recently growing with the construction of the new high-speed rail network.

Italian narrow gauge railways

In Italy, track gauges of 1,100 mm (3 ft 7+5⁄16 in), 1,000 mm (3 ft 3+3⁄8 in), 950 mm (3 ft 1+3⁄8 in), 850 mm (2 ft 9+15⁄32 in), 760 mm (2 ft 5+15⁄16 in) and 600 mm (1 ft 11+5⁄8 in) are or were present.

The aforementioned 950 mm "Italian metre gauge" was also used in the former Italian colonies of Eritrea (Eritrean Railway), Libya (Italian Libya Railways), and Somalia (Mogadishu-Villabruzzi Railway).

See also

References

  1. ↑ "Parovoz". Archived from the original on 13 July 2012.
  2. ↑ Total length of tracks: double tracks are counted twice.
  3. ↑ "La rete oggi". RFI Rete Ferroviaria Italiana. Archived from the original on 4 December 2011. Retrieved 15 November 2011.
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