Iberian-gauge railways

Iberian gauge (Spanish: ancho ibérico, trocha ibérica, Portuguese: bitola ibérica) is a track gauge of 1,668 mm (5 ft 5+21⁄32 in), most extensively used by the railways of Spain and Portugal. This is the second-widest gauge in regular use anywhere in the world. Indian gauge railways, 5 ft 6 in (1,676 mm), are 8 mm (5⁄16 in) wider.

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

As finally established in 1955, the Iberian gauge is a compromise between the similar, but slightly different, gauges adopted as respective national standards in Spain and Portugal in the mid-19th century. The main railway networks of Spain were initially constructed to a 1,672 mm (5 ft 5+13⁄16 in) gauge of six Castilian feet. Those of Portugal were instead built to a 1,435 mm (4 ft 8+1⁄2 in) and later railways to a 1,664 mm (5 ft 5+1⁄2 in) gauge of five Portuguese feet – close enough to allow interoperability with Spanish railways.

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