It joined the Main West Line at Byrock with the town of Brewarrina on the Darling River.
At that date, the Western Line had only reached Dubbo and its extension to Nyngan was under construction.
The Parliamentary Standing Committee on Public Works recommended on 22 June 1898 that the proposed Byrock to Brewarrina branch line should be built, subject to a levee being paid by Crown Lands Lessees in the area served by the proposed line.
The line opened as far as Tarrion Creek in July, 1900 and was completed to Brewarrina on 2 September 1901.
[3] For the greater part of its life, the predominant train service was a Mixed train connecting with the Through Mail at Byrock on Tuesdays, Thursdays and Saturdays and returning to Byrock on Mondays, Wednesdays and Fridays.