The line was worked by the Bengal and North-Western Railway(BNWR).
The Segowlie-Raxaul Railway was absorbed by the Tirhoot State Railway around 1920.
Note +Sagauli and Raxaul are the place names used in The Imperial Gazetteer of India rather than +Segowlie(the Company name)
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/8/15/1025 “ The Segowlie-Raksaul Branch Railway Company Limited, Indenture between the parties; 1896" (Note Catalogue spelling difference of Raxaul)
- “British Library Archives and Manuscripts Catalogue” - Search; Retrieved 27 Jan 2016