The extension opened in stages and by 1902 a distance of 43 miles(70km) was opened from Calicut leaving a about 17 miles still to be completed up to Azhikal. . The line reached Azhikal in 1904 and finally reached Mangalore in 1907 to form the Jalarpet-Mangalore Mainline .
Refer to FIBIS Fact File #4: “Research sources for Indian Railways, 1845-1947” - available from the 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  gives the following: -
- L/F/8/15/1077 “Madras Railway Company, Contract for the construction of a railway from Calicut to Baliapatam and Azikhal; 1901”
- "Kozhikode Railway Station" Wikipedia
See Madras Railway up to 1907,
then South Indian Railway from 1908.
- Grace's Guide "The Engineer", 13 June 1902, page 583;Retrieved 10 Dec 2015
- “Administration Report on Railways 1918” pages 136 (pdf144); Retrieved 28 Nov 2016
- “British Library Archives and Manuscripts Catalogue” - Search; Retrieved 21 Jan 2016