It ran through the Catlins region in southwestern Otago and was built in sections between 1879 and 1915 .
The Catlins River Branch was a branch line railway that formed part of New Zealand 's national rail network .
Catlins River Branch ran through the Catlins region in southwestern Otago and was built in sections between 1879 and 1915 .
The Catlins River Branch was a branch line railway that formed part of New Zealand 's national rail network .