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The '''Jamalpur Tunnel''' was constructed in 1860-61 as part of the [[East Indian Railway]] expansion from [[Howrah]] towards [[Delhi]]. The railway had reached [[Rajmahal]] in 1860, proceeded westward following the Ganges River reaching [[Bhagalpur]] in 1861, [[Jamalpur]] in 1862 and finally reaching [[Delhi]] in 1866 <ref> “Symphony of Progress - The Saga of the Eastern Railway 1854-2003”; published by Eastern Railway, 2003; page 13 and 14</ref> <ref>[http://wikimapia.org/536639/Railway-Tunnel-Jamalpur Wikimapia "Railway Tunnel Jamalpur"]; Retrieved 13 June 2016</ref>


The route required the construction of a tunnel through the Rajmahal range to cross the Jamalpur hills between Jamalpur and Ratanpur. The broad gauge([[Rail_gauge#Broad_Gauge|BG]]) railway was single track with crossing places and included the single track 275m long tunnel <ref>[https://www.onepetro.org/conference-paper/ISRM-ARMS5-2008-087 Design Of A Railway Tunnel by R.K. Goel (Central Institute of Mining & Fuel Research), 2008"]; Retrieved 13 June 2016</ref>
[[First Chord Line (EIR)]] 
The existing Sahibganj Loop on the Kiul- Bhagalpur section of the East Central Railway crosses the Jamalpur hills through a tunnel between Jamalpur and Ratanpur Stations. The entire section has double broad gauge (BG) track but through the existing tunnel only single BG track is available. In order to have double track for operating up and down traffic on separate lines through the Jamalpur hills, another tunnel in the close proximity to existing tunnel is envisaged. The existing tunnel of the Ratanpur - Jamalpur section is 275m long aligned in East- West direction. The tunnel was constructed in 1861 and working satisfactorily since then [1]. No major problem and repair/maintenance works have been reported during the use of the tunnel. The D-shaped tunnel has arched roof of radius 3.963m. The height of the tunnel above the rail level is
== References ==
<references />
[[Category:Locations]]
[[Category: Railways]]
[[Category: Railway Constructions]]

Latest revision as of 17:57, 30 December 2020

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