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The '''Bengal-Nagpur Railway''' (BNR) was formed in 1887 to take over the metre gauge ([[Rail_gauge_#Metre_Gauge|MG]]) [[Nagpur Chhattisgarh Railway|Nagpur-Chhattisgarh Railway]], to convert the existing metre gauge track to broad gauge ([[Rail_gauge#Broad_Gauge|BG]]) and to extend the system eastwards to join the [[East Indian Railway]] at [[Asansol]], 132 miles from Calcutta.<ref>[https://ia801009.us.archive.org/8/items/BombayBarodaAndCentralIndiaRailwaySystem/Bombay_Baroda_And_Central_India_Railway_System.pdf " Administration Report on the Railways in India – corrected up to 31st March 1918"; Superintendent of Government Printing, Calcutta; page 157]; Retrieved 17 Dec 2015</ref>

The BNR was the last major railway formed to benefit from a Government guarantee, with the system from the outset owned by the Government of India [[Government of India |GoI]] who contracted the BNR company to manage matters, initially for 25 years and therafter determinable every 10 years.  The BNR was the last company to be nationalised, on 1 October 1944. In 1952, the BNR was merged with the [[East Indian Railway]] to form Indian Railways' '''Eastern Railway''' but in 1955, BNR re-emerged to form '''South Eastern Railway'''.