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The '''Nalhati-Azimganj Railway''', was the original section of the line constructed in 1863 by [[Indian Branch Railway]]. The line used a 4ft(1222mm) [[Rail_gauge_#4 foot Gauge|unique rail gauge]]and the total length was 17 miles(27km).  Worked by [[Oudh and Rohilkhand Railway]](O&RR), 1863-72. The Indian Branch Railway Company was purchased by the Government of India([[Government of India |GoI]]) in 1872 and the line was renamed '''Nalhati State Railway'''. The track was subsequently converted to 5 ft 6 in(1,676 mm) broad gauge([[Rail_gauge#Broad_Gauge|BG]]). The line was leased to [[East Indian Railway]] (EIR), 1892 and later absorbed into the EIR network.