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The line from [[Cawnpore]] via [[Lucknow]] to [[Fyzabad]] was surveyed in 1862 by the IBR and an engineer examined the proposed route <ref name=Mukher>[https://books.google.com/books/about/The_Pictorial_Lucknow.html?id=7RCe2E5ch80C&redir_esc=y Google Books “The Pictorial Lucknow” by P. C. Mukherji, pages 81-82. First published Lucknow 1883, reprinted by AES New Delhi 2003]; Retrieved 2 Sept 2016</ref>. Construction of the line progressed very slowly; and the 42 miles (67km) long, was opened on 23 Apr 1867. This became the ‘Cawnpore Branch’ of the [[Oudh and Rohilkhand Railway]](O&RR). The gauge of the original line is not known but was converted to Broad Gauge([[Rail_gauge#Broad_Gauge|BG]]) specification and became part of the O&RR network <ref name=Admin>[https://archive.org/stream/BombayBarodaAndCentralIndiaRailwaySystem/Bombay_Baroda_And_Central_India_Railway_System#page/n139/mode/1up “Administration Report on Railways 1918” page 132, pdf page 139]; Retrieved 2 Sept 2016</ref>.