The Cooch Behar State Railway (CBSR) was a 762 mm (2 ft 6 in) narrow gauge railway line that was built between Jayanti in the current Alipurduar district of West Bengal, India to Lalmonirhat in the current Lalmonirhat district in Bangladesh before partition between 1893 and 1898.

The line originated from Jayanti near the foothills of Eastern Himalayas and went via Alipurduar, Cooch Behar, Dinhata and Gitaldaha to finally join the narrow-gauge track of Kaunia–Dharlla State Railway at Mogalhat.

As a part of linking with the 581 kilometres (361 mi) long Katihar–Raiganj–Dinajpur–Parbatipur–Rangpur–Kaunia main metre-gauge line the Kaunia–Mogalhat–Gitaldaha NG section was converted to metre gauge from 1901 to 1902.

The 25.27 kilometres (15.70 mi) long Gitaldaha-Golakganj section was built as a part of the main metre-gauge line in 1902 via Bamanhat & Sonahat.

Further the Gitaldaha–Mogalhat rail transit point became defunct as floods washed away the railway bridge over Dharla River.