Editing Track gauge (section)

==Units==
The gauge is defined in [[imperial units]], [[metric unit]]s or [[International System of Units|SI]] units.

Imperial units were established in the United Kingdom by the [[Weights and Measures Act 1824]]. The [[United States customary units]] for length did not agree with the imperial system until 1959, when one [[international yard]] was defined as 0.9144 meters and, as derived units, 1 foot (={{frac|1|3|}}&nbsp;yd) as 0.3048 meter and 1 inch (={{frac|1|36|}}&nbsp;yd) as 25.4&nbsp;mm.

The list shows the imperial and other units that have been used for track gauge definitions:
{| class="wikitable sortable"
! Unit
! SI equivalent
! class="unsortable" | Track gauge example
|-
| [[Imperial foot]]
| {{nowrap|304.8 mm}}
| 
|-
| [[Spanish customary units|Castilian foot]]{{citation needed|date=November 2014}}
| {{nowrap|278.6 mm}}
| {{Plainlist|1= <!--comment|dummy parameter number required if list contains "="-->
* 6 Castilian feet = {{track gauge|1672mm|lk=on}}
* 2 Castilian feet {{nowrap|558 mm}} {{nowrap|(1 ft {{frac|9|31|32}} in)}}
}}
|-
| [[Portuguese customary units|Portuguese foot]]
| {{nowrap|332.8 mm}}
| 5 Portuguese feet = {{track gauge|1664mm|lk=on}}
|-
| [[Swedish units of measurement|Swedish foot]]
| {{nowrap|296.904 mm}}
| {{Plainlist|1= <!--comment|dummy parameter number required if list contains "="-->
* 3 Swedish feet = {{track gauge|891mm|lk=on}}
* 2.7 Swedish feet = {{track gauge|802mm|lk=on}}
}}
|-
| [[Obsolete German units of measurement|Prussian foot]] (Rheinfuß)
| {{nowrap|313.85 mm}}
| {{frac|2|1|2}} Prussian feet = {{track gauge|785mm|lk=on}}
|-
| [[Austrian fathom]]{{citation needed|date=May 2013}}
| {{nowrap|1520 mm}}
| {{frac|1|2}} Austrian fathom = {{track gauge|760mm|lk=on}}
|}