The Katihar–Siliguri line is a railway line connecting Katihar in the Indian state of Bihar with Siliguri Junction in West Bengal, via Barsoi, Dalkhola, Kishanganj, Aluabari Road Junction, Thakurganj, Adhikari, Naxalbari, Bagdogra and Matigara. It was a metre-gauge track that was converted to 1,676 mm (5 ft 6 in) 5 ft 6 in (1,676 mm) broad gauge in 2011. Another railway line with a slightly different route with shorter distance exists between Siliguri Junction and Aluabari Road Junction (Islampur) and its details are available in Howrah–New Jalpaiguri line article.