Project Unigauge is an ongoing exercise by Indian Railways to standardise most of the rail gauges in India to 1,676 mm (5 ft 6 in) broad gauge.
Indian Railways currently has significant lengths of four different gauges: the 1,676 mm (5 ft 6 in) broad gauge, the 1,000 mm (3 ft 3 3⁄8 in) metre gauge, and two narrow gauges 762 mm (2 ft 6 in) and 610 mm (2 ft). The total length of track used by Indian Railways was about 115,000 km (71,000 mi) while the total route length of the network was 65,000 km (40,000 mi) in 2011.
Urban mass rapid transport systems (Metro rail) built or being built in six large cities in India use both 1,676 mm (5 ft 6 in) broad gauge and 1,435 mm (4 ft 8 1⁄2 in) standard gauge. However these Metro railways are independent corporations not under the jurisdiction of Indian Railways and therefore Project Unigauge does not apply to them.
Read more about Project Unigauge: History, Current Status, Heritage Lines That Will Not Be Converted, Effects On Loading Gauge and Rolling Stock, Remaining, Under Conversion, Maps, See Also
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