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===Dual gauge===
{{Main|Dual gauge}}
[[File:Cross-section of Australian triple-gauge track.png|thumb|right|Cross-section of triple-gauge track at [[Gladstone railway station, South Australia|Gladstone]] and [[Peterborough railway station, South Australia|Peterborough]], [[South Australia]], before gauge standardisation in 1970 (click to enlarge)]]▼
[[File:Mixed gauge Sassari.jpg|thumb|Mixed gauge track at Sassari, Sardinia: {{Track gauge|1435mm|allk=on}} and {{Track gauge|950mm|lk=on}}]]
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<blockquote>In November 1871 a novelty in the shape of a ''mixed-gauge'' goods train was introduced between Truro and Penzance. It was worked by a narrow-gauge engine, and behind the narrow-gauge trucks came a broad-gauge match-truck with wide buffers and sliding shackles, followed by the broad-gauge trucks. Such trains continued to run in West Cornwall until the abolition of the Broad Gauge; they had to stop or come down to walking pace at all stations where fixed points existed and the narrow portion side-stepped to right or left.</blockquote>
===Triple Gauge===
▲[[File:Cross-section of Australian triple-gauge track.png|thumb|right|Cross-section of triple-gauge track at [[Gladstone railway station, South Australia|Gladstone]] and [[Peterborough railway station, South Australia|Peterborough]], [[South Australia]], before gauge standardisation in 1970 (click to enlarge)]]
[[File:Triple Gauge Africa.jpg|frame|A triple gauge sleeper can handle the three main gauges found in Africa, including [[Tanzania]]: 1000 mm, 1067 mm and 1435 mm.]]
{{RailGauge|1000mm}} and {{RailGauge|1067mm}} are too close to allow 3-rail dual gauge track; you have to have 4-rail dual gauge track. But if you have 4-rail gauge, then you can include {{RailGauge|1435mm}} gauge ([[standard gauge]]) at the cost of slightly longer sleepers. This was solution was adopted in Afica.
==Nominal track gauge==
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