Indian Railways is a public sector undertaking by the Government of India that is centrally supervised by the Ministry of Railways in the country. Its vast network extends up to 65,000 km and has around 75,000 stations as halts, making it the fourth largest in the world in terms of network coverage. Introduced by the British in 1853, it gained the nationalized status post-independence in 1951. Indian Railways presently operates long distance express trains, suburban or local trains, goods carriers and narrow gauges. It also features multi-gauge system (same track for different gauge trains). The entire railway network in the country is categorized under different zones and further into many other divisions. There are 68 such divisions now. The 17 major railway zones in the country include the following:
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