Break of gauge
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With railways, a break of gauge occurs where a line of one track gauge meets a line of a different gauge. Trains and rolling stock generally cannot run through without some form of conversion between
A cartoon depicting the "horrors of goods transfer" at the break of gauge at Gloucester in 1843
Bogie-exchange station in Ukraine
Variable gauge axles on a Spanish train designed for intercity travel to France
A train on 1435 mm standard-gauge track leaving Russia. It is bound for Manzhouli, China, having replaced its 1520 mm-gauge bogies with standard-gauge bogies at the bogie exchange yard in the distance.
Rail transport in Iran
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Iran has a state-owned railway system built to standard gauge which falls under the remit of the Ministry of Roads & Urban Development. The primary rail carrier is the Islamic Republic of Iran Railway
Narrow-gauge railway Tehran – Rey
Following the Anglo-Soviet invasion of Iran, American and British railroad crews pose alongside a locomotive, ca. 1943.
A railway bridge at Do Ab, Mazandaran province on the Gorgan — Bandar Torkaman line, 2007.
Passengers on board a train from Yazd to Tehran, 2014