Editing Dual gauge (section)

===More than three gauges===
[[File: Beyer, Peacock and Co Gorton Foundry in 1870.jpg|thumb|The Gorton Foundry of [[Beyer, Peacock & Company]] was typical of locomotive and rolling stock manufacturers that exported to many countries. This track of four gauges traversed two turntables, requiring the rails to be centralised.]]

Three gauges are the maximum found on operating railway lines and in railway yards, but some rolling stock manufacturers collocate more than three lines in their works, depending on the particular gauges of their customers.