<Table> <Tr> <Td_colspan="2"> Indian Railways population density map </Td> </Tr> <Tr> <Th> Reporting mark </Th> <Td> IR </Td> </Tr> <Tr> <Th> Locale </Th> <Td> India </Td> </Tr> <Tr> <Th> Dates of operation </Th> <Td> 8 May 1845 (1845 - 05 - 08)--present </Td> </Tr> <Tr> <Th> Track gauge </Th> <Td> 1,676 mm (5 ft 6 in) 1,000 mm (3 ft 3 ⁄ in) 762 mm (2 ft 6 in) 610 mm (2 ft) </Td> </Tr> <Tr> <Th> Electrification </Th> <Td> 25,367 kilometres (15,762 mi) </Td> </Tr> <Tr> <Th> Length </Th> <Td> 67,368 kilometres (41,861 mi) (route) 93,902 kilometres (58,348 mi) (running track) 121,407 kilometres (75,439 mi) (total track) </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Indian Railways population density map </Td> </Tr> <Tr> <Th> Reporting mark </Th> <Td> IR </Td> </Tr> <Tr> <Th> Locale </Th> <Td> India </Td> </Tr>

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