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The '''Tirhoot State Railway''' (TSR) was originally named '''Tirhut Railway''' as a temporary famine relief line in 1874 and owned by the Provincial Government. Ownership is believed to have been later transferred to the Government of India. The railway was worked by the GoI as part of the Indian State Railways from opening to late 1886 and then by Tirhoot State Railway (TSR) from late 1886 to 30th June 1890.

The [[Gunduck Bridge]] was constructed by the Tirhoot State Railway completing the connection with the Bengal and North- Western Railway. The bridge was opened in 1887 and consisted of 5 spans of 250 feet with a half mile viaduct on one bank of the river. [[Horace Bell]] was the Engineer-in-Chief and [[R.A.Way]] was the Executive Engineer in charge of construction. Tirhoot State Railway (TSR) operated the line from late 1886 to 30th June 1890. TSR was then worked by Bengal and North Western Railway (B&NWR) from 1st July 1890.