Upon competition, the 762 mm (2 ft 6 in) railway became the longest narrow gauge system in the region.
The first section was built from Bostan Junction to Muslimbagh during World War I by the Balochistan Chrome Ore Company and opened in 1916.
Muslimbagh had and abundance of Chromite and was transported by the railway to munitions production factories in the British Empire.
[3] The second section was built by the North Western State Railway as an extension from Muslimbagh to Fort Sandeman (now Zhob).
Tracks coaches and other rolling stock remain at Bostan Junction with a depot and turntable as seen on Google Earth in 2023.