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The '''Delhi-Umballa-Kalka Railway'''(DKR) Company was formed in 1889. The broad gauge([[Rail_gauge#Broad_Gauge|BG]]) line ran north from [[Delhi]] via [[Ambala|Umballa]]+(Ambala) +]] to [[Kalka ]] in the Himalayan foothills where it joined there was a connection to the DKR owned [[Kalka-Simla Railway]]narrow gauge([[Rail_gauge#Narrow_Gauge|NG]]) line that opened in 1903 <ref name=name/> <ref>[https://archive.org/stream/BombayBarodaAndCentralIndiaRailwaySystem/Bombay_Baroda_And_Central_India_Railway_System#page/n68/mode/1up " Administration Report on the Railways in India – corrected up to 31st March 1918"; Superintendent of Government Printing, Calcutta; page 60]; Retrieved 24 Dec 2017</ref>.

Construction of the 161 mile(243km) stated in May 1889 and opened in March 1891. The BG line was initially worked by the [[East Indian Railway]](EIR) and taken over by <ref name=Admin>[https://archive.org/stream/BombayBarodaAndCentralIndiaRailwaySystem/Bombay_Baroda_And_Central_India_Railway_System#page/n68/mode/1up " Administration Report on the Government Railways in India – corrected up to 31st March 1918"; Superintendent of India([[Government of India |GoI Printing, Calcutta; page 60]]) in 1925; Retrieved 14 Jun 2020</ref>.

The DKR Company signed a contact in 1898 with GoI for the construction and working of a 2ft/610mm narrow gauge([[Rail_gauge#Narrow_GaugeThanesar-Kaithal Railway|NG'''Thanesar-Kaithal Branch''' - ''see separate page'']]ran from Kurukshetra on the DKR, 30 miles(48km) line from [[Kalka]] to [[Simla]]. The line was , opened to traffic in 1903 and as a result of high capital cost and high maintenance cost the Delhi-Umballa-Kalka Railway Company was by 1904 in severe financial crisis. The Kalka-Simla Railway was purchased by GoI in January 1906. The line was later converted to 2ft 6inDec 1910 <ref name=Admin/762mm narrow gauge>.

The DKR Company signed a contact in 1909 with Taken over by the [[Government of India ]]([[Government of India |GoI for ]]) in 1925 <ref name=GovUK>[http://discovery.nationalarchives.gov.uk/details/rd/d2cc94a1-245a-4594-b7e3-ba22bf6a8cf7 IOR "Records of the construction Delhi-Umballa-Kalka Railway Company" IOR/L/AG/46/9"]; Retrieved 14 Jun 2020</ref> and the working of transferred to the '''[[Thanesar-Kaithal North Western Railway]]''' line (NWR) on 1 Apr 1926 <ref>[https://ia801605.us.archive. This branch was operating org/30/items/in 1912 making [[Kaithal]] an important trading centre. This line was worked by the EIR ernet.dli.2015.36650/2015.36650.India-Railway-Board-History-Of-Indian-Railways-Constructed-And-In-Progress.pdf US Archive .org pdf download of ‘History Of Indian Railways, constructed and taken over in progress’, 31 March 1937 by the GoI in 1925‘The Government of India – Railway Department’ page 151 pdf 190]; Retrieved 14 Jun 2020</ref>.

+Note==Records==Refer to FIBIS Fact File #4: “Research sources for Indian Railways, 1845-1947” - available from the [http://www.fibis.org/store/fibis-books-and-publications/bff-0004-research-sources-for-indian-railways-1845-1947/ Fibis shop]. This Fact File contains invaluable advice on 'Researching ancestors in the UK records of Indian Railways' with particular reference to the [[India Office Records]] (IOR) held at the [[British Library]]

An on-line search of the IOR records relating to this railway<ref name=name>[http://searcharchives.bl.uk/primo_library/libweb/action/search.do?vid=IAMS_VU2 British Library “British Library Archives and Manuscripts Catalogue” - Search]; Retrieved 20 Jan 2016</ref> gives 23 references. The most important being:- *'''L/F/8/13/945/1 ''' “Delhi Umballa Kalka Railway Company Limited, Contract for the construction of the Delhi UmballaKalka Railway; 1889”*'''L/AG/46/9''' is used in this text as it was “Records of the name Delhi-Umballa-Kalka Railway Company; 1898-1907”*'''L/AG/46/29 ''' “Records of the India Office relating to the Delhi-Umballa-Kalka Railway Company.; 1889-1926”

'''Amballa''' and '''Ambala''' ==Personnel Records==There are also recorded in differet documents as various spellings .  None of these appear no Personnel Records held in The Imperial Gazeteer of India 1908 which is taken to be the definitive sourceIOR

*[http://discovery.nationalarchives.gov.uk/details/rd/d2cc94a1-245a-4594-b7e3-ba22bf6a8cf7 Records of the Delhi-Umballa-Kalka Railway Company . IOR/L/AG/46/9]*[http://en.wikipedia.org/wiki/Delhi%E2%80%93Kalka_line Wikipedia]*[http://discovery.nationalarchives.gov.uk/details/rd/cf5560ecDelhi-acde-43c8-bc60-3c70300a2f43 Branch line from Thanesar to Kaithal. IOR/L/F/8/17/1234]*[https://books.google.co.uk/books?id=VE71IqAC0YYC&pg=PA121&lpg=PA121&dq=Thanesar-Kaithal+Branch+Railway&source=bl&ots=Kqg80eSgWS&sig=mD15h4UNOdgftFsD3jCJgvbRqwA&hl=fr&sa=X&ved=0CDkQ6AEwA2oVChMIocqV65qXyQIVhJUOCh3ugwGW#v=onepage&q=Thanesar-Kaithal%20%20Railway&f=false Haryana: Past and Present by Suresh K Sharma c.1912Kalka Line"]Wikipedia