Mysore-Nanjangud Railway was a short metre gauge(MG) line that extended the Mysore State Railway(MSR) mainline from Mysore to Nanjangud. The railway was owned by the Princely Mysore State Durbar and worked by the MSR .
The MSR became the Madras and Southern Mahratta Railway(M&SMR) in 1907, they worked the line until 1919.
In 1919, the Mysore State successfully sought the reversion of the ‘Mysore -Bangalore Section’ and two branch lines, the ‘Birur-Shimoga Railway’ and the ‘Mysore-Nanjangud Railway’ became the ‘Mysore State Railway’(MSR) 
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
- " Administration Report on the Railways in India – corrected up to 31st March 1918"; Superintendent of Government Printing, Calcutta; page 92; Retrieved 26 Jan 2016
- British Library IOR L/F/8/20/1704 ‘Contract with the Madras and Southern Mahratta Railway Co.Ltd as to the transfer of Mysore-Nanjangud , Birur-Shimoga and Mysore-Bangalore Railways sections of the Mysore Railway to the Mysore Durbar. Dated 24 Oct 1924 effective 1 Oct 1919