900 mm (2 ft 11+7⁄16 in) narrow-gauge railways are generally found in Europe.
This gauge is mostly used for light urban rail networks, industrial and agricultural railways.
In Sweden, there was an extensive network of railways with 891 mm (2 ft 11+3⁄32 in) track, some of them remain.
This close enough to 900 mm (2 ft 11+7⁄16 in) that they are more or less compatible, and some sales of rolling stock between the gauges have taken place.
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