|Bannu–Tank Branch Line|
|Other name(s)||Trans–Indus Railway|
|Native name||بنوں–ٹانک فرعی ریلوے خط|
|Line length||122 km (76 mi)|
|Track gauge||762 mm (2 ft 6 in)|
Bannu–Tank Branch Line (Urdu: بنوں–ٹانک فرعی ریلوے خط) was one of several branch lines in Pakistan, operated and maintained by Pakistan Railways. The line began at Bannu and ended at Tank Junction. The total length of this railway line was 122 kilometers (76 mi) with 7 railway stations. It was known by locals as "choti rail", since it was the only 762 mm (2 ft 6 in) narrow gauge railway in the country. The line was dismantled in 1995.
The rail line was originally built by NWR as the Trans–Indus Railway in 1913, which extended from Kalabagh station to Bannu station, which today is part of the Daud Khel–Lakki Marwat Branch Line. The line was then further extended in 1916 to reach Tank Junction station. The line was also sometimes referred to as the Mari Indus Railway.
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