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The '''Tannah Viaduct''' was the first railway bridge to be constructed in India, it was a vital link in the section of the [[Great Indian Peninsula Railway]] from [[Thana]] to [[Callian]] (later named Kalyan) which opened in May 18451854. The construction of this portion was difficult as it involved a two-line Tannah Viaduct over the estuary and two tunnels <ref>[https://en.wikipedia.org/wiki/Great_Indian_Peninsula_Railway#The_Sahyadri_crossed Wikipedia “Great Indian Peninsula Railway – The Sahyadi crossed”]; Retrieved 28 Jun 2016</ref>.
[[File:Tannah Viaduct, 1854 - The Engineer 1867 cut.jpg|thumb|Tannah Viaduct from "The Engineer" <ref>[http://www.gracesguide.co.uk/images/b/bb/Er18671011.pdf Grace's Guide The Engineer 11th Dec 1867 page 316, pdf page 8]; Retrieved 28 Jun 2016</ref>]]
The Tannah Viaduct comprised a number of masonry arches and an iron bridge section, imported from Britain, to allow navigation.
